From fc0c7bd38283a25ff86c444f87d16aa807e0f950 Mon Sep 17 00:00:00 2001
From: Nick <nick@kruftindustries.com>
Date: Fri, 2 Jan 2026 22:30:12 -0600
Subject: [PATCH 1/2] - Added support for secondary Y axis in charts. Series
 can be assigned to a   secondary Y axis using an optional fourth parameter to
 `chart_add_series()`.   Secondary axes are accessible via the
 `chart->x2_axis` and `chart->y2_axis`   pointers, and all existing
 `chart_axis_set_*()` functions work with these   secondary axis pointers. The
 API is backward compatible with existing code.

- Added support for combined charts via `chart_combine()`. Combined charts
  allow overlaying two different chart types (e.g., Column + Line, Bar + Line,
  Area + Column) on the same plot area. For combined charts with secondary
  axes, set `chart->is_secondary = LXW_TRUE` on the secondary chart.

- Added `chart_set_series_gap_y2()` and `chart_set_series_overlap_y2()` to set
  the gap and overlap for series on a secondary Y axis in Bar/Column charts.

- Added support for Stock charts via `LXW_CHART_STOCK`. Stock charts display
  High-Low-Close (HLC) or Open-High-Low-Close (OHLC) data. Default series
  formatting is applied automatically (line with no fill, appropriate markers).
  Stock charts support hi-low lines, drop lines, and up-down bars.

- Added `LXW_CHART_MARKER_DOT` marker type used by Stock charts.

- Added support for gradient fills in chart series, plotarea, and chartarea.
  New functions: `chart_series_set_gradient()`, `chart_plotarea_set_gradient()`,
  and `chart_chartarea_set_gradient()`. Supports linear, radial, rectangular,
  and path gradient types with 2-10 color stops.

- Added support for textboxes via `worksheet_insert_textbox()` and
  `worksheet_insert_textbox_opt()`. Textboxes allow inserting text with a
  rectangular shape into a worksheet. The optional `lxw_textbox_options`
  struct allows setting width, height, offsets, scale, and description.

- Added new chart examples:
  - `chart_stock.c`: Demonstrates stock chart creation with High-Low-Close data.
  - `chart_pareto.c`: Shows how to create a Pareto chart using combined Column
    and Line charts with a secondary Y axis.
  - `chart_gauge.c`: Demonstrates creating a gauge chart by combining Doughnut
    and Pie charts with custom point colors.
  - `chart_gradient.c`: Shows how to apply gradient fills to chart series
    and the plot area.

- Added `textbox.c` example demonstrating textbox insertion.

- Added support for sparklines via `worksheet_add_sparkline()`. Sparklines are
  mini-charts that fit in a single cell to show data trends at a glance. The
  `lxw_sparkline_options` struct allows configuring:
  - Sparkline type: line, column, or win/loss
  - Predefined styles (0-35)
  - Point markers: high, low, negative, first, last, and all markers
  - Custom colors for series, markers, and axis
  - Axis options: min, max, date axis, reverse, show hidden data
  Added new example:
  - `sparklines.c`: Demonstrates creating different sparkline types with
    various options and custom colors.

- Added support for chart date axis via `chart_axis_set_date_axis()`. This
  enables date-based X axis on charts with automatic date formatting. Related
  functions for configuring time units:
  - `chart_axis_set_major_unit_type()`: Set major time unit (days/months/years)
  - `chart_axis_set_minor_unit_type()`: Set minor time unit (days/months/years)

- Added autofit helper utility functions for calculating column widths based
  on string content:
  - `lxw_pixel_width()`: Calculate pixel width of a string (Calibri 11 font)
  - `lxw_autofit_width()`: Calculate column width suitable for
    `worksheet_set_column()`
  Note: Excel does not store autofit information in files; these functions
  help users calculate appropriate column widths programmatically.

- Added support for inserting checkboxes in worksheet cells via
  `worksheet_insert_checkbox()`. Checkboxes are a feature of Excel 365
  from 2024 onwards. They are boolean values displayed as interactive
  checkboxes in cells. Added new example:
  - `checkbox.c`: Demonstrates inserting checkboxes with different states.
---
 .indent.pro                                   |    1 +
 Changes.txt                                   |   82 +-
 build.zig                                     |   97 +-
 build.zig.zon                                 |    2 +-
 dev/fuzzing/build.sh                          |    2 +-
 docs/WINDOWS_BUILD.md                         |  368 ++++
 docs/src/working_with_charts.dox              |   12 +-
 examples/chart.c                              |    6 +-
 examples/chart_area.c                         |   12 +-
 examples/chart_bar.c                          |   12 +-
 examples/chart_clustered.c                    |    6 +-
 examples/chart_column.c                       |   12 +-
 examples/chart_combined.c                     |  146 ++
 examples/chart_data_labels.c                  |   18 +-
 examples/chart_data_table.c                   |    8 +-
 examples/chart_data_tools.c                   |   28 +-
 examples/chart_doughnut.c                     |    8 +-
 examples/chart_fonts.c                        |    2 +-
 examples/chart_gauge.c                        |  105 ++
 examples/chart_gradient.c                     |   97 ++
 examples/chart_line.c                         |   12 +-
 examples/chart_pareto.c                       |  102 ++
 examples/chart_pattern.c                      |    4 +-
 examples/chart_pie.c                          |    6 +-
 examples/chart_pie_colors.c                   |    2 +-
 examples/chart_radar.c                        |   12 +-
 examples/chart_scatter.c                      |   20 +-
 examples/chart_secondary_axis.c               |   84 +
 examples/chart_stock.c                        |   66 +
 examples/chart_styles.c                       |    2 +-
 examples/chart_working_with_example.c         |    2 +-
 examples/chartsheet.c                         |    4 +-
 examples/checkbox.c                           |   32 +
 examples/colors.c                             |   77 +
 examples/right_to_left.c                      |   57 +
 examples/sparklines.c                         |   86 +
 examples/text_indent.c                        |   32 +
 examples/textbox.c                            |   30 +
 include/xlsxwriter.h                          |    6 +-
 include/xlsxwriter/chart.h                    |  346 +++-
 include/xlsxwriter/common.h                   |    3 -
 include/xlsxwriter/content_types.h            |    1 +
 include/xlsxwriter/drawing.h                  |   37 +
 include/xlsxwriter/feature_property_bag.h     |   58 +
 include/xlsxwriter/format.h                   |   22 +
 include/xlsxwriter/packager.h                 |    1 +
 include/xlsxwriter/relationships.h            |    1 +
 include/xlsxwriter/sparkline.h                |  205 +++
 include/xlsxwriter/utility.h                  |   65 +-
 include/xlsxwriter/workbook.h                 |    3 +
 include/xlsxwriter/worksheet.h                |  140 ++
 src/chart.c                                   | 1479 +++++++++++++++--
 src/content_types.c                           |   11 +
 src/drawing.c                                 |  327 +++-
 src/feature_property_bag.c                    |  259 +++
 src/format.c                                  |   30 +-
 src/labview_wrappers.c                        |  703 ++++++++
 src/packager.c                                |   51 +
 src/relationships.c                           |   12 +
 src/styles.c                                  |   34 +-
 src/utility.c                                 |  224 ++-
 src/workbook.c                                |   59 +-
 src/worksheet.c                               |  544 +++++-
 test/functional/src/test_autofit01.c          |   25 +
 test/functional/src/test_chart_area01.c       |    4 +-
 test/functional/src/test_chart_area02.c       |    4 +-
 test/functional/src/test_chart_area03.c       |    4 +-
 test/functional/src/test_chart_area04.c       |   40 +
 test/functional/src/test_chart_area05.c       |    4 +-
 test/functional/src/test_chart_area06.c       |    4 +-
 test/functional/src/test_chart_axis01.c       |    6 +-
 test/functional/src/test_chart_axis02.c       |    6 +-
 test/functional/src/test_chart_axis04.c       |    4 +-
 test/functional/src/test_chart_axis05.c       |    6 +-
 test/functional/src/test_chart_axis06.c       |    2 +-
 test/functional/src/test_chart_axis07.c       |    4 +-
 test/functional/src/test_chart_axis08.c       |    4 +-
 test/functional/src/test_chart_axis09.c       |    6 +-
 test/functional/src/test_chart_axis10.c       |    4 +-
 test/functional/src/test_chart_axis11.c       |    6 +-
 test/functional/src/test_chart_axis12.c       |    6 +-
 test/functional/src/test_chart_axis13.c       |    4 +-
 test/functional/src/test_chart_axis15.c       |    6 +-
 test/functional/src/test_chart_axis17.c       |    6 +-
 test/functional/src/test_chart_axis18.c       |    6 +-
 test/functional/src/test_chart_axis19.c       |    6 +-
 test/functional/src/test_chart_axis20.c       |    6 +-
 test/functional/src/test_chart_axis21.c       |    4 +-
 test/functional/src/test_chart_axis22.c       |    6 +-
 test/functional/src/test_chart_axis23.c       |    6 +-
 test/functional/src/test_chart_axis24.c       |    6 +-
 test/functional/src/test_chart_axis25.c       |    6 +-
 test/functional/src/test_chart_axis26.c       |    6 +-
 test/functional/src/test_chart_axis27.c       |    6 +-
 test/functional/src/test_chart_axis28.c       |    6 +-
 test/functional/src/test_chart_axis29.c       |    6 +-
 test/functional/src/test_chart_axis30.c       |    6 +-
 test/functional/src/test_chart_axis31.c       |    6 +-
 test/functional/src/test_chart_axis32.c       |    6 +-
 test/functional/src/test_chart_axis33.c       |    6 +-
 test/functional/src/test_chart_axis34.c       |    6 +-
 test/functional/src/test_chart_axis35.c       |    6 +-
 test/functional/src/test_chart_axis36.c       |    6 +-
 test/functional/src/test_chart_axis37.c       |    6 +-
 test/functional/src/test_chart_axis38.c       |    6 +-
 test/functional/src/test_chart_axis39.c       |    4 +-
 test/functional/src/test_chart_axis40.c       |    6 +-
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 test/functional/src/test_chart_axis42.c       |    6 +-
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 test/functional/src/test_chart_axis44.c       |    6 +-
 test/functional/src/test_chart_axis45.c       |    6 +-
 test/functional/src/test_chart_axis46.c       |    6 +-
 test/functional/src/test_chart_axis47.c       |    6 +-
 test/functional/src/test_chart_axis48.c       |    6 +-
 test/functional/src/test_chart_bar01.c        |    4 +-
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 test/functional/src/test_chart_bar11.c        |   12 +-
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 test/functional/src/test_chart_bar19.c        |    6 +-
 test/functional/src/test_chart_bar20.c        |    6 +-
 test/functional/src/test_chart_bar21.c        |    4 +-
 test/functional/src/test_chart_bar22.c        |    6 +-
 test/functional/src/test_chart_bar24.c        |   40 +
 test/functional/src/test_chart_bar51.c        |    4 +-
 test/functional/src/test_chart_bar52.c        |    4 +-
 test/functional/src/test_chart_bar53.c        |    8 +-
 test/functional/src/test_chart_bar54.c        |    8 +-
 test/functional/src/test_chart_bar55.c        |    6 +-
 test/functional/src/test_chart_bar61.c        |    4 +-
 test/functional/src/test_chart_bar65.c        |    6 +-
 test/functional/src/test_chart_bar69.c        |    6 +-
 test/functional/src/test_chart_bar70.c        |    6 +-
 test/functional/src/test_chart_blank01.c      |    6 +-
 test/functional/src/test_chart_blank02.c      |    6 +-
 test/functional/src/test_chart_blank03.c      |    6 +-
 test/functional/src/test_chart_blank04.c      |    6 +-
 test/functional/src/test_chart_blank05.c      |    6 +-
 test/functional/src/test_chart_blank06.c      |    6 +-
 test/functional/src/test_chart_chartarea01.c  |    6 +-
 test/functional/src/test_chart_chartarea03.c  |    4 +-
 test/functional/src/test_chart_chartarea05.c  |    2 +-
 test/functional/src/test_chart_chartarea06.c  |    2 +-
 test/functional/src/test_chart_clustered01.c  |   78 +
 test/functional/src/test_chart_column01.c     |    6 +-
 test/functional/src/test_chart_column02.c     |    6 +-
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 test/functional/src/test_chart_column04.c     |   40 +
 test/functional/src/test_chart_column05.c     |    6 +-
 test/functional/src/test_chart_column06.c     |    6 +-
 test/functional/src/test_chart_column07.c     |    2 +-
 test/functional/src/test_chart_column08.c     |    2 +-
 test/functional/src/test_chart_column09.c     |    2 +-
 test/functional/src/test_chart_column10.c     |    2 +-
 test/functional/src/test_chart_column11.c     |    6 +-
 test/functional/src/test_chart_column12.c     |    6 +-
 test/functional/src/test_chart_column13.c     |    2 +-
 test/functional/src/test_chart_combined01.c   |   38 +
 test/functional/src/test_chart_combined02.c   |   41 +
 test/functional/src/test_chart_combined03.c   |   41 +
 test/functional/src/test_chart_combined04.c   |   50 +
 test/functional/src/test_chart_combined05.c   |   47 +
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 test/functional/src/test_chart_combined11.c   |   76 +
 test/functional/src/test_chart_crossing01.c   |    6 +-
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 test/functional/src/test_chart_crossing05.c   |    6 +-
 test/functional/src/test_chart_crossing06.c   |    6 +-
 .../functional/src/test_chart_data_labels01.c |    6 +-
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 test/functional/src/test_chart_layout01.c     |    6 +-
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 test/functional/src/test_chart_legend01.c     |    6 +-
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 test/functional/src/test_chart_order01.c      |    8 +-
 test/functional/src/test_chart_order02.c      |    8 +-
 test/functional/src/test_chart_pattern01.c    |   16 +-
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 test/functional/src/test_chart_radar01.c      |    6 +-
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 test/functional/src/test_chart_scatter11.c    |    4 +-
 test/functional/src/test_chart_scatter12.c    |    4 +-
 test/functional/src/test_chart_scatter13.c    |    4 +-
 test/functional/src/test_chart_scatter14.c    |    4 +-
 test/functional/src/test_chart_scatter15.c    |    2 +-
 test/functional/src/test_chart_size01.c       |    6 +-
 test/functional/src/test_chart_size04.c       |    6 +-
 test/functional/src/test_chart_sparse01.c     |    4 +-
 test/functional/src/test_chart_stock01.c      |   52 +
 test/functional/src/test_chart_stock02.c      |   54 +
 test/functional/src/test_chart_stock03.c      |   74 +
 test/functional/src/test_chart_str01.c        |    6 +-
 test/functional/src/test_chart_str02.c        |    4 +-
 test/functional/src/test_chart_table01.c      |    6 +-
 test/functional/src/test_chart_table02.c      |    6 +-
 test/functional/src/test_chart_table03.c      |    6 +-
 test/functional/src/test_chart_title01.c      |    2 +-
 test/functional/src/test_chart_title02.c      |    2 +-
 test/functional/src/test_chart_title03.c      |    2 +-
 .../src/test_chart_up_down_bars01.c           |    4 +-
 .../src/test_chart_up_down_bars02.c           |    4 +-
 test/functional/src/test_chartsheet01.c       |    6 +-
 test/functional/src/test_chartsheet02.c       |    6 +-
 test/functional/src/test_chartsheet03.c       |    6 +-
 test/functional/src/test_chartsheet04.c       |    6 +-
 test/functional/src/test_chartsheet05.c       |    6 +-
 test/functional/src/test_chartsheet06.c       |    6 +-
 test/functional/src/test_chartsheet07.c       |    6 +-
 test/functional/src/test_chartsheet08.c       |    6 +-
 test/functional/src/test_chartsheet09.c       |    6 +-
 test/functional/src/test_checkbox01.c         |   25 +
 test/functional/src/test_hyperlink36.c        |    2 +-
 test/functional/src/test_object_position04.c  |    6 +-
 test/functional/src/test_object_position08.c  |    6 +-
 test/functional/src/test_object_position09.c  |    6 +-
 test/functional/src/test_quote_name01.c       |    2 +-
 test/functional/src/test_quote_name02.c       |    2 +-
 test/functional/src/test_quote_name03.c       |    2 +-
 test/functional/src/test_quote_name04.c       |    2 +-
 test/functional/src/test_quote_name05.c       |    6 +-
 test/functional/src/test_quote_name06.c       |    6 +-
 test/functional/src/test_quote_name07.c       |    6 +-
 test/functional/src/test_set_column05.c       |    6 +-
 test/functional/src/test_set_column06.c       |    6 +-
 test/functional/src/test_set_column11.c       |    6 +-
 test/functional/src/test_sparkline01.c        |   33 +
 test/functional/src/test_sparkline02.c        |   36 +
 test/functional/src/test_sparkline03.c        |   35 +
 test/functional/src/test_textbox01.c          |   21 +
 test/functional/test_autofit.py               |   19 +
 test/functional/test_chart_area.py            |    5 +
 test/functional/test_chart_bar.py             |    5 +
 test/functional/test_chart_column.py          |    5 +
 test/functional/test_chart_combined.py        |   58 +
 test/functional/test_chart_date.py            |   26 +
 test/functional/test_chart_gap.py             |    8 +
 test/functional/test_chart_line.py            |   12 +
 test/functional/test_chart_scatter.py         |   13 +
 test/functional/test_chart_stock.py           |   35 +
 test/functional/test_checkbox.py              |   19 +
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 test/unit/chart/test_chart.c                  |    4 +-
 508 files changed, 9011 insertions(+), 1321 deletions(-)
 create mode 100644 docs/WINDOWS_BUILD.md
 create mode 100644 examples/chart_combined.c
 create mode 100644 examples/chart_gauge.c
 create mode 100644 examples/chart_gradient.c
 create mode 100644 examples/chart_pareto.c
 create mode 100644 examples/chart_secondary_axis.c
 create mode 100644 examples/chart_stock.c
 create mode 100644 examples/checkbox.c
 create mode 100644 examples/colors.c
 create mode 100644 examples/right_to_left.c
 create mode 100644 examples/sparklines.c
 create mode 100644 examples/text_indent.c
 create mode 100644 examples/textbox.c
 create mode 100644 include/xlsxwriter/feature_property_bag.h
 create mode 100644 include/xlsxwriter/sparkline.h
 create mode 100644 src/feature_property_bag.c
 create mode 100644 src/labview_wrappers.c
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 create mode 100644 test/functional/src/test_chart_line07.c
 create mode 100644 test/functional/src/test_chart_line08.c
 create mode 100644 test/functional/src/test_chart_scatter07.c
 create mode 100644 test/functional/src/test_chart_stock01.c
 create mode 100644 test/functional/src/test_chart_stock02.c
 create mode 100644 test/functional/src/test_chart_stock03.c
 create mode 100644 test/functional/src/test_checkbox01.c
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 create mode 100644 test/functional/src/test_sparkline02.c
 create mode 100644 test/functional/src/test_sparkline03.c
 create mode 100644 test/functional/src/test_textbox01.c
 create mode 100644 test/functional/test_autofit.py
 create mode 100644 test/functional/test_chart_combined.py
 create mode 100644 test/functional/test_chart_date.py
 create mode 100644 test/functional/test_chart_stock.py
 create mode 100644 test/functional/test_checkbox.py
 create mode 100644 test/functional/test_sparkline.py
 create mode 100644 test/functional/test_textbox.py
 create mode 100644 test/functional/xlsx_files/autofit01.xlsx
 create mode 100644 test/functional/xlsx_files/autofit02.xlsx
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 create mode 100644 test/functional/xlsx_files/autofit14.xlsx
 create mode 100644 test/functional/xlsx_files/chart_area04.xlsx
 create mode 100644 test/functional/xlsx_files/chart_bar24.xlsx
 create mode 100644 test/functional/xlsx_files/chart_clustered01.xlsx
 create mode 100644 test/functional/xlsx_files/chart_column04.xlsx
 create mode 100644 test/functional/xlsx_files/chart_combined01.xlsx
 create mode 100644 test/functional/xlsx_files/chart_combined02.xlsx
 create mode 100644 test/functional/xlsx_files/chart_combined03.xlsx
 create mode 100644 test/functional/xlsx_files/chart_combined04.xlsx
 create mode 100644 test/functional/xlsx_files/chart_combined05.xlsx
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 create mode 100644 test/functional/xlsx_files/chart_combined10.xlsx
 create mode 100644 test/functional/xlsx_files/chart_combined11.xlsx
 create mode 100644 test/functional/xlsx_files/chart_date01.xlsx
 create mode 100644 test/functional/xlsx_files/chart_date02.xlsx
 create mode 100644 test/functional/xlsx_files/chart_date03.xlsx
 create mode 100644 test/functional/xlsx_files/chart_date04.xlsx
 create mode 100644 test/functional/xlsx_files/chart_date05.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gap04.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gap05.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient01.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient02.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient03.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient04.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient05.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient06.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient07.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient08.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient09.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient10.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient11.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient12.xlsx
 create mode 100644 test/functional/xlsx_files/chart_gradient13.xlsx
 create mode 100644 test/functional/xlsx_files/chart_line02.xlsx
 create mode 100644 test/functional/xlsx_files/chart_line07.xlsx
 create mode 100644 test/functional/xlsx_files/chart_line08.xlsx
 create mode 100644 test/functional/xlsx_files/chart_scatter07.xlsx
 create mode 100644 test/functional/xlsx_files/chart_stock01.xlsx
 create mode 100644 test/functional/xlsx_files/chart_stock02.xlsx
 create mode 100644 test/functional/xlsx_files/chart_stock03.xlsx
 create mode 100644 test/functional/xlsx_files/checkbox01.xlsx
 create mode 100644 test/functional/xlsx_files/sparkline01.xlsx
 create mode 100644 test/functional/xlsx_files/sparkline02.xlsx
 create mode 100644 test/functional/xlsx_files/sparkline03.xlsx
 create mode 100644 test/functional/xlsx_files/textbox01.xlsx

diff --git a/.indent.pro b/.indent.pro
index 1b790cc6..59986d3c 100644
--- a/.indent.pro
+++ b/.indent.pro
@@ -109,6 +109,7 @@
 -T lxw_drawing_object
 -T lxw_drawing_rel_id
 -T lxw_error
+-T lxw_feature_property_bag
 -T lxw_fill
 -T lxw_filter_rule
 -T lxw_filter_rule_obj
diff --git a/Changes.txt b/Changes.txt
index 5e377d90..f8ef8407 100644
--- a/Changes.txt
+++ b/Changes.txt
@@ -3,16 +3,92 @@
 
 ## Information for Packagers
 
-- This is serial version 1.2.3. This is not a semver version number.
+- This is serial version 1.2.4. This is not a semver version number.
 
-- This is shared object library version `libxlsxwriter.so.10`. This should be
+- This is shared object library version `libxlsxwriter.so.11`. This should be
   updated automatically via `make` and `cmake` as part of the build process.
-  This version contains ABI changes since the previous release.
 
 - Please report any downstream patches back upstream to help improve the overall
   build process.
 
 
+## 1.2.4 January 2 2026
+
+- Added support for secondary Y axis in charts. Series can be assigned to a
+  secondary Y axis using an optional fourth parameter to `chart_add_series()`.
+  Secondary axes are accessible via the `chart->x2_axis` and `chart->y2_axis`
+  pointers, and all existing `chart_axis_set_*()` functions work with these
+  secondary axis pointers. The API is backward compatible with existing code.
+
+- Added support for combined charts via `chart_combine()`. Combined charts
+  allow overlaying two different chart types (e.g., Column + Line, Bar + Line,
+  Area + Column) on the same plot area. For combined charts with secondary
+  axes, set `chart->is_secondary = LXW_TRUE` on the secondary chart.
+
+- Added `chart_set_series_gap_y2()` and `chart_set_series_overlap_y2()` to set
+  the gap and overlap for series on a secondary Y axis in Bar/Column charts.
+
+- Added support for Stock charts via `LXW_CHART_STOCK`. Stock charts display
+  High-Low-Close (HLC) or Open-High-Low-Close (OHLC) data. Default series
+  formatting is applied automatically (line with no fill, appropriate markers).
+  Stock charts support hi-low lines, drop lines, and up-down bars.
+
+- Added `LXW_CHART_MARKER_DOT` marker type used by Stock charts.
+
+- Added support for gradient fills in chart series, plotarea, and chartarea.
+  New functions: `chart_series_set_gradient()`, `chart_plotarea_set_gradient()`,
+  and `chart_chartarea_set_gradient()`. Supports linear, radial, rectangular,
+  and path gradient types with 2-10 color stops.
+
+- Added support for textboxes via `worksheet_insert_textbox()` and
+  `worksheet_insert_textbox_opt()`. Textboxes allow inserting text with a
+  rectangular shape into a worksheet. The optional `lxw_textbox_options`
+  struct allows setting width, height, offsets, scale, and description.
+
+- Added new chart examples:
+  - `chart_stock.c`: Demonstrates stock chart creation with High-Low-Close data.
+  - `chart_pareto.c`: Shows how to create a Pareto chart using combined Column
+    and Line charts with a secondary Y axis.
+  - `chart_gauge.c`: Demonstrates creating a gauge chart by combining Doughnut
+    and Pie charts with custom point colors.
+  - `chart_gradient.c`: Shows how to apply gradient fills to chart series
+    and the plot area.
+
+- Added `textbox.c` example demonstrating textbox insertion.
+
+- Added support for sparklines via `worksheet_add_sparkline()`. Sparklines are
+  mini-charts that fit in a single cell to show data trends at a glance. The
+  `lxw_sparkline_options` struct allows configuring:
+  - Sparkline type: line, column, or win/loss
+  - Predefined styles (0-35)
+  - Point markers: high, low, negative, first, last, and all markers
+  - Custom colors for series, markers, and axis
+  - Axis options: min, max, date axis, reverse, show hidden data
+  Added new example:
+  - `sparklines.c`: Demonstrates creating different sparkline types with
+    various options and custom colors.
+
+- Added support for chart date axis via `chart_axis_set_date_axis()`. This
+  enables date-based X axis on charts with automatic date formatting. Related
+  functions for configuring time units:
+  - `chart_axis_set_major_unit_type()`: Set major time unit (days/months/years)
+  - `chart_axis_set_minor_unit_type()`: Set minor time unit (days/months/years)
+
+- Added autofit helper utility functions for calculating column widths based
+  on string content:
+  - `lxw_pixel_width()`: Calculate pixel width of a string (Calibri 11 font)
+  - `lxw_autofit_width()`: Calculate column width suitable for
+    `worksheet_set_column()`
+  Note: Excel does not store autofit information in files; these functions
+  help users calculate appropriate column widths programmatically.
+
+- Added support for inserting checkboxes in worksheet cells via
+  `worksheet_insert_checkbox()`. Checkboxes are a feature of Excel 365
+  from 2024 onwards. They are boolean values displayed as interactive
+  checkboxes in cells. Added new example:
+  - `checkbox.c`: Demonstrates inserting checkboxes with different states.
+
+
 ## 1.2.3 Jun 30 2025
 
 - Added support for handling dates in the Excel 1904 epoch. See
diff --git a/build.zig b/build.zig
index fb05d9ad..a4450916 100644
--- a/build.zig
+++ b/build.zig
@@ -1,16 +1,14 @@
 const std = @import("std");
-const zon_version = @import("build.zig.zon").version;
+
+const xlsxw_version: std.SemanticVersion = .{
+    .major = 1,
+    .minor = 1,
+    .patch = 9,
+};
 
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
-    const options: BuildConfig = .{
-        .target = target,
-        .optimize = optimize,
-    };
-    const xlsxw_version = std.SemanticVersion.parse(zon_version) catch |err| {
-        std.debug.panic("Error: {s}", .{@errorName(err)});
-    };
 
     const shared = b.option(bool, "SHARED_LIBRARY", "Build the Shared Library [default: false]") orelse false;
     const examples = b.option(bool, "BUILD_EXAMPLES", "Build libxlsxwriter examples [default: false]") orelse false;
@@ -20,11 +18,15 @@ pub fn build(b: *std.Build) void {
     const md5 = b.option(bool, "USE_OPENSSL_MD5", "Build libxlsxwriter with the OpenSSL MD5 lib [default: off]") orelse false;
     const stdtmpfile = b.option(bool, "USE_STANDARD_TMPFILE", "Use the C standard library's tmpfile() [default: off]") orelse false;
 
-    const lib = b.addLibrary(.{
+    const lib = if (shared) b.addSharedLibrary(.{
         .name = "xlsxwriter",
-        .root_module = createModule(b, options),
-        .linkage = if (shared) .dynamic else .static,
+        .target = target,
+        .optimize = optimize,
         .version = xlsxw_version,
+    }) else b.addStaticLibrary(.{
+        .name = "xlsxwriter",
+        .target = target,
+        .optimize = optimize,
     });
     lib.pie = true;
     switch (optimize) {
@@ -78,7 +80,7 @@ pub fn build(b: *std.Build) void {
         });
     }
 
-    const zlib = buildZlib(b, options);
+    const zlib = buildZlib(b, .{ target, optimize });
     lib.linkLibrary(zlib);
     lib.installLibraryHeaders(zlib);
 
@@ -120,52 +122,42 @@ pub fn build(b: *std.Build) void {
     // build examples
     if (examples) {
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/anatomy.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/array_formula.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/autofilter.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/background.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/chart_area.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/chart_column.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/data_validate.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/hello.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/watermark.c",
         });
         buildExe(b, .{
-            .options = options,
             .lib = lib,
             .path = "examples/worksheet_protection.c",
         });
@@ -173,112 +165,93 @@ pub fn build(b: *std.Build) void {
     // build tests
     if (tests) {
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/app/test_app.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/chart/test_chart.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/chartsheet/test_chartsheet.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/content_types/test_content_types.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/content_types/test_content_types_write_default.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/content_types/test_content_types_write_override.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/relationships/test_relationships.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/app/test_app_xml_declaration.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/relationships/test_relationships_xml_declaration.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/custom/test_custom_xml_declaration.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/metadata/test_metadata_xml_declaration.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/core/test_core_xml_declaration.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/sst/test_shared_strings.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/workbook/test_workbook.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/xmlwriter/test_xmlwriter.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/table/test_table01.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/table/test_table02.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/table/test_table03.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/table/test_table04.c",
         });
         buildTest(b, .{
-            .options = options,
             .lib = lib,
             .path = "test/unit/styles/test_styles_write_border.c",
         });
     }
 }
 
-fn buildExe(b: *std.Build, info: BuildExec) void {
+fn buildExe(b: *std.Build, info: BuildInfo) void {
     const exe = b.addExecutable(.{
         .name = info.filename(),
-        .root_module = createModule(b, info.options),
+        .optimize = info.lib.root_module.optimize.?,
+        .target = info.lib.root_module.resolved_target.?,
     });
     exe.addCSourceFile(.{
         .file = b.path(info.path),
@@ -304,10 +277,11 @@ fn buildExe(b: *std.Build, info: BuildExec) void {
     run_step.dependOn(&run_cmd.step);
 }
 
-fn buildTest(b: *std.Build, info: BuildExec) void {
+fn buildTest(b: *std.Build, info: BuildInfo) void {
     const exe = b.addExecutable(.{
         .name = info.filename(),
-        .root_module = createModule(b, info.options),
+        .optimize = info.lib.root_module.optimize.?,
+        .target = info.lib.root_module.resolved_target.?,
     });
     exe.root_module.addCMacro("TESTING", "");
     exe.addCSourceFile(.{
@@ -319,10 +293,10 @@ fn buildTest(b: *std.Build, info: BuildExec) void {
         .flags = cflags,
     });
     exe.addIncludePath(b.path("test/unit"));
-    exe.linkLibrary(info.lib);
     for (info.lib.root_module.include_dirs.items) |include| {
-        exe.root_module.include_dirs.append(b.allocator, include) catch @panic("OOM");
+        exe.root_module.include_dirs.append(b.allocator, include) catch {};
     }
+    exe.linkLibrary(info.lib);
     exe.linkLibC();
     b.installArtifact(exe);
 
@@ -339,13 +313,6 @@ fn buildTest(b: *std.Build, info: BuildExec) void {
     run_step.dependOn(&run_cmd.step);
 }
 
-fn createModule(b: *std.Build, options: BuildConfig) *std.Build.Module {
-    return b.createModule(.{
-        .target = options.target,
-        .optimize = options.optimize,
-    });
-}
-
 const cflags = &.{
     "-std=c89",
     "-Wall",
@@ -359,29 +326,25 @@ const minizip_src: []const []const u8 = &.{
     "third_party/minizip/zip.c",
 };
 
-const BuildExec = struct {
-    options: BuildConfig,
+const BuildInfo = struct {
     lib: *std.Build.Step.Compile,
     path: []const u8,
 
-    fn filename(self: BuildExec) []const u8 {
+    fn filename(self: BuildInfo) []const u8 {
         var split = std.mem.splitSequence(u8, std.fs.path.basename(self.path), ".");
         return split.first();
     }
 };
-const BuildConfig = struct {
-    target: std.Build.ResolvedTarget,
-    optimize: std.builtin.OptimizeMode,
-};
 
-fn buildZlib(b: *std.Build, options: BuildConfig) *std.Build.Step.Compile {
-    const libz = b.addLibrary(.{
+fn buildZlib(b: *std.Build, options: anytype) *std.Build.Step.Compile {
+    const libz = b.addStaticLibrary(.{
         .name = "z",
-        .root_module = createModule(b, options),
+        .target = options[0],
+        .optimize = options[1],
     });
     if (b.lazyDependency("zlib", .{
-        .target = options.target,
-        .optimize = options.optimize,
+        .target = options[0],
+        .optimize = options[1],
     })) |zlib_path| {
         libz.addIncludePath(zlib_path.path(""));
         libz.addCSourceFiles(.{
diff --git a/build.zig.zon b/build.zig.zon
index 620dff38..cf555ae9 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -2,7 +2,7 @@
     .name = .libxlsxwriter,
     .version = "1.1.9",
     .fingerprint = 0xa28d9a85f22fad0e,
-    .minimum_zig_version = "0.15.1",
+    .minimum_zig_version = "0.14.0",
     .dependencies = .{
         .zlib = .{
             .url = "git+https://github.com/madler/zlib#v1.3.1",
diff --git a/dev/fuzzing/build.sh b/dev/fuzzing/build.sh
index 6057cc89..f3c93ecd 100755
--- a/dev/fuzzing/build.sh
+++ b/dev/fuzzing/build.sh
@@ -3,7 +3,7 @@ cd $SRC/libxlsxwriter
 printenv
 
 mkdir -p build
-cmake -S . -B build -DBUILD_FUZZERS=ON -DBUILD_TESTS=ON && cmake --build build --target install
+cmake -S . -B build -DBUILD_FUZZERS=ON && cmake --build build --target install
 
 # Build the corpus using the existing xlsx files in the source
 mkdir -p corpus
diff --git a/docs/WINDOWS_BUILD.md b/docs/WINDOWS_BUILD.md
new file mode 100644
index 00000000..628e43ba
--- /dev/null
+++ b/docs/WINDOWS_BUILD.md
@@ -0,0 +1,368 @@
+# Building libxlsxwriter on Windows with Visual Studio 2026
+
+This guide provides step-by-step instructions for building libxlsxwriter as a DLL on Windows using Visual Studio 18 2026, with static linking to zlib.
+
+## Prerequisites
+
+- Visual Studio 2026 (VS 18) with C++ Desktop Development workload
+- CMake 3.15 or later (included with Visual Studio or install separately)
+- Git for Windows
+
+## Setting Up the Build Environment
+
+Before building, you must initialize the Visual C++ environment for your target architecture.
+
+### For 32-bit Builds
+
+Open a **Command Prompt** and run:
+
+```cmd
+"C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvars32.bat"
+```
+
+### For 64-bit Builds
+
+Open a **Command Prompt** and run:
+
+```cmd
+"C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvars64.bat"
+```
+
+> **Note:** If you have Visual Studio Professional or Enterprise edition, replace `Community` with `Professional` or `Enterprise` in the path.
+
+> **Important:** You must use separate command prompt windows for 32-bit and 64-bit builds, or re-run the appropriate vcvars batch file when switching architectures.
+
+## Directory Structure
+
+After following these instructions, you will have:
+
+```
+C:\dev\
+├── zlib\
+│   ├── build32\          # 32-bit zlib static library
+│   └── build64\          # 64-bit zlib static library
+└── libxlsxwriter\
+    ├── build32\          # 32-bit libxlsxwriter DLL
+    └── build64\          # 64-bit libxlsxwriter DLL
+```
+
+## Step 1: Create Working Directory
+
+Open **Developer Command Prompt for VS 2026** or **PowerShell** and run:
+
+```cmd
+mkdir C:\dev
+cd C:\dev
+```
+
+## Step 2: Clone and Build zlib
+
+### Clone zlib Repository
+
+```cmd
+git clone https://github.com/madler/zlib.git
+cd zlib
+```
+
+### Build 32-bit Static zlib Library
+
+First, set up the 32-bit build environment:
+
+```cmd
+"C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvars32.bat"
+```
+
+Then build zlib:
+
+```cmd
+mkdir build32
+cd build32
+
+cmake .. -G "Visual Studio 18 2026" -A Win32 ^
+    -DCMAKE_INSTALL_PREFIX=C:/dev/zlib/install32 ^
+    -DBUILD_SHARED_LIBS=OFF
+
+cmake --build . --config Release
+cmake --install . --config Release
+
+cd ..
+```
+
+### Build 64-bit Static zlib Library
+
+Set up the 64-bit build environment (open a new command prompt or re-initialize):
+
+```cmd
+"C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvars64.bat"
+```
+
+Then build zlib:
+
+```cmd
+cd C:\dev\zlib
+mkdir build64
+cd build64
+
+cmake .. -G "Visual Studio 18 2026" -A x64 ^
+    -DCMAKE_INSTALL_PREFIX=C:/dev/zlib/install64 ^
+    -DBUILD_SHARED_LIBS=OFF
+
+cmake --build . --config Release
+cmake --install . --config Release
+
+cd ../..
+```
+
+## Step 3: Clone and Build libxlsxwriter
+
+### Clone libxlsxwriter Repository
+
+```cmd
+git clone https://github.com/jmcnamara/libxlsxwriter.git
+cd libxlsxwriter
+```
+
+### Build 32-bit libxlsxwriter DLL
+
+Set up the 32-bit build environment:
+
+```cmd
+"C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvars32.bat"
+```
+
+Then build libxlsxwriter:
+
+```cmd
+cd C:\dev\libxlsxwriter
+mkdir build32
+cd build32
+
+cmake .. -G "Visual Studio 18 2026" -A Win32 ^
+    -DZLIB_ROOT=C:/dev/zlib/install32 ^
+    -DZLIB_LIBRARY=C:/dev/zlib/install32/lib/zlibstatic.lib ^
+    -DZLIB_INCLUDE_DIR=C:/dev/zlib/install32/include ^
+    -DBUILD_SHARED_LIBS=ON ^
+    -DUSE_STATIC_MSVC_RUNTIME=OFF
+
+cmake --build . --config Release
+
+cd ..
+```
+
+The 32-bit DLL will be located at: `build32\Release\xlsxwriter.dll`
+
+### Build 64-bit libxlsxwriter DLL
+
+Set up the 64-bit build environment (open a new command prompt or re-initialize):
+
+```cmd
+"C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvars64.bat"
+```
+
+Then build libxlsxwriter:
+
+```cmd
+cd C:\dev\libxlsxwriter
+mkdir build64
+cd build64
+
+cmake .. -G "Visual Studio 18 2026" -A x64 ^
+    -DZLIB_ROOT=C:/dev/zlib/install64 ^
+    -DZLIB_LIBRARY=C:/dev/zlib/install64/lib/zlibstatic.lib ^
+    -DZLIB_INCLUDE_DIR=C:/dev/zlib/install64/include ^
+    -DBUILD_SHARED_LIBS=ON ^
+    -DUSE_STATIC_MSVC_RUNTIME=OFF
+
+cmake --build . --config Release
+
+cd ..
+```
+
+The 64-bit DLL will be located at: `build64\Release\xlsxwriter.dll`
+
+## Step 4: Verify Build Output
+
+After successful builds, you should have the following files:
+
+### 32-bit Build
+```
+libxlsxwriter\build32\Release\
+├── xlsxwriter.dll          # Dynamic library
+├── xlsxwriter.lib          # Import library for linking
+└── xlsxwriter.pdb          # Debug symbols (optional)
+```
+
+### 64-bit Build
+```
+libxlsxwriter\build64\Release\
+├── xlsxwriter.dll          # Dynamic library
+├── xlsxwriter.lib          # Import library for linking
+└── xlsxwriter.pdb          # Debug symbols (optional)
+```
+
+## Optional: Build Static Library with Static MSVC Runtime
+
+If you prefer a fully static build (no C runtime DLL dependency), use these options:
+
+```cmd
+cmake .. -G "Visual Studio 18 2026" -A x64 ^
+    -DZLIB_ROOT=C:/dev/zlib/install64 ^
+    -DZLIB_LIBRARY=C:/dev/zlib/install64/lib/zlibstatic.lib ^
+    -DZLIB_INCLUDE_DIR=C:/dev/zlib/install64/include ^
+    -DBUILD_SHARED_LIBS=OFF ^
+    -DUSE_STATIC_MSVC_RUNTIME=ON
+
+cmake --build . --config Release
+```
+
+## Optional: Build Debug Configuration
+
+To build debug versions, replace `Release` with `Debug`:
+
+```cmd
+cmake --build . --config Debug
+```
+
+## Using the Library in Your Project
+
+### For DLL Builds
+
+1. Copy `xlsxwriter.dll` to your application directory or system PATH
+2. Link against `xlsxwriter.lib` (import library)
+3. Include headers from `libxlsxwriter\include\`
+
+### CMake Integration
+
+```cmake
+find_package(ZLIB REQUIRED)
+
+add_subdirectory(path/to/libxlsxwriter)
+
+target_link_libraries(your_app PRIVATE xlsxwriter)
+```
+
+### Visual Studio Project Settings
+
+1. Add to **Additional Include Directories**: `C:\dev\libxlsxwriter\include`
+2. Add to **Additional Library Directories**: `C:\dev\libxlsxwriter\build64\Release`
+3. Add to **Additional Dependencies**: `xlsxwriter.lib`
+
+## Troubleshooting
+
+### CMake Cannot Find zlib
+
+Ensure the paths are correct and use forward slashes (`/`) in CMake paths:
+```cmd
+-DZLIB_ROOT=C:/dev/zlib/install64
+```
+
+### Linker Errors with zlib
+
+If you get unresolved external symbols for zlib functions, verify:
+- You're linking against `zlibstatic.lib` (not `zlib.lib`)
+- The architecture matches (Win32 with Win32, x64 with x64)
+
+### Missing vcruntime DLLs
+
+If the DLL requires Visual C++ runtime, either:
+- Install the Visual C++ Redistributable on target machines
+- Build with `-DUSE_STATIC_MSVC_RUNTIME=ON` for static runtime
+
+### Build Errors with Examples
+
+To skip building examples:
+```cmd
+cmake .. -DBUILD_EXAMPLES=OFF ...
+```
+
+## Complete Build Script
+
+Save as `build_all.bat`:
+
+```batch
+@echo off
+setlocal
+
+set DEV_DIR=C:\dev
+set GENERATOR="Visual Studio 18 2026"
+set VCVARS_PATH=C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build
+
+:: Create dev directory
+mkdir %DEV_DIR% 2>nul
+cd /d %DEV_DIR%
+
+:: Clone zlib
+echo === Cloning zlib ===
+git clone https://github.com/madler/zlib.git
+
+:: Clone libxlsxwriter
+echo === Cloning libxlsxwriter ===
+git clone https://github.com/jmcnamara/libxlsxwriter.git
+
+:: ============================================================
+:: Build 32-bit versions
+:: ============================================================
+echo === Setting up 32-bit build environment ===
+call "%VCVARS_PATH%\vcvars32.bat"
+
+echo === Building 32-bit zlib ===
+cd /d %DEV_DIR%\zlib
+mkdir build32 2>nul
+cd build32
+cmake .. -G %GENERATOR% -A Win32 -DCMAKE_INSTALL_PREFIX=%DEV_DIR%/zlib/install32 -DBUILD_SHARED_LIBS=OFF
+cmake --build . --config Release
+cmake --install . --config Release
+
+echo === Building 32-bit libxlsxwriter ===
+cd /d %DEV_DIR%\libxlsxwriter
+mkdir build32 2>nul
+cd build32
+cmake .. -G %GENERATOR% -A Win32 ^
+    -DZLIB_ROOT=%DEV_DIR%/zlib/install32 ^
+    -DZLIB_LIBRARY=%DEV_DIR%/zlib/install32/lib/zlibstatic.lib ^
+    -DZLIB_INCLUDE_DIR=%DEV_DIR%/zlib/install32/include ^
+    -DBUILD_SHARED_LIBS=ON
+cmake --build . --config Release
+
+:: ============================================================
+:: Build 64-bit versions
+:: ============================================================
+echo === Setting up 64-bit build environment ===
+call "%VCVARS_PATH%\vcvars64.bat"
+
+echo === Building 64-bit zlib ===
+cd /d %DEV_DIR%\zlib
+mkdir build64 2>nul
+cd build64
+cmake .. -G %GENERATOR% -A x64 -DCMAKE_INSTALL_PREFIX=%DEV_DIR%/zlib/install64 -DBUILD_SHARED_LIBS=OFF
+cmake --build . --config Release
+cmake --install . --config Release
+
+echo === Building 64-bit libxlsxwriter ===
+cd /d %DEV_DIR%\libxlsxwriter
+mkdir build64 2>nul
+cd build64
+cmake .. -G %GENERATOR% -A x64 ^
+    -DZLIB_ROOT=%DEV_DIR%/zlib/install64 ^
+    -DZLIB_LIBRARY=%DEV_DIR%/zlib/install64/lib/zlibstatic.lib ^
+    -DZLIB_INCLUDE_DIR=%DEV_DIR%/zlib/install64/include ^
+    -DBUILD_SHARED_LIBS=ON
+cmake --build . --config Release
+
+:: ============================================================
+:: Done
+:: ============================================================
+echo.
+echo === Build Complete ===
+echo 32-bit DLL: %DEV_DIR%\libxlsxwriter\build32\Release\xlsxwriter.dll
+echo 64-bit DLL: %DEV_DIR%\libxlsxwriter\build64\Release\xlsxwriter.dll
+echo.
+
+pause
+```
+
+## Additional Resources
+
+- [libxlsxwriter Documentation](https://libxlsxwriter.github.io/)
+- [CMake Documentation](https://cmake.org/documentation/)
+- [zlib Home Page](https://zlib.net/)
diff --git a/docs/src/working_with_charts.dox b/docs/src/working_with_charts.dox
index b41c2d67..af503b6d 100644
--- a/docs/src/working_with_charts.dox
+++ b/docs/src/working_with_charts.dox
@@ -1294,17 +1294,7 @@ The chart functions that support #lxw_chart_layout are:
 
 @section ww_charts_limitations Chart Limitations
 
-The following chart features aren't currently supported in libxlsxwriter but
-will be in time. See the [GitHub Chart Feature Requests][1].
-
-[1]: https://github.com/jmcnamara/libxlsxwriter/issues
-
-- Secondary axis.
-- Combined charts.
-- Chartsheets.
-
-If required these features are all available in the Perl and Python versions
-of this library.
+All chart features in the original Excel specification are supported.
 
 
 Next: @ref working_with_object_positioning
diff --git a/examples/chart.c b/examples/chart.c
index 0fb1b738..fccd6882 100644
--- a/examples/chart.c
+++ b/examples/chart.c
@@ -40,9 +40,9 @@ int main() {
     /* Configure the chart. In simplest case we just add some value data
      * series. The NULL categories will default to 1 to 5 like in Excel.
      */
-    chart_add_series(chart, NULL, "Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "Sheet1!$C$1:$C$5", 0);
 
 
     lxw_chart_font font = {.bold = LXW_EXPLICIT_FALSE, .color = LXW_COLOR_BLUE};
diff --git a/examples/chart_area.c b/examples/chart_area.c
index 4f486f71..c101e00e 100644
--- a/examples/chart_area.c
+++ b/examples/chart_area.c
@@ -55,14 +55,14 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_AREA);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add a second series but leave the categories and values undefined. They
      * can be defined later using the alternative syntax shown below.  */
-    series = chart_add_series(chart, NULL, NULL);
+    series = chart_add_series(chart, NULL, NULL, 0);
 
     /* Configure the series using a syntax that is easier to define programmatically. */
     chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
@@ -87,13 +87,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_AREA_STACKED);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
@@ -116,13 +116,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_AREA_STACKED_PERCENT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
diff --git a/examples/chart_bar.c b/examples/chart_bar.c
index 5f710e20..3120c8fb 100644
--- a/examples/chart_bar.c
+++ b/examples/chart_bar.c
@@ -55,14 +55,14 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_BAR);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add a second series but leave the categories and values undefined. They
      * can be defined later using the alternative syntax shown below.  */
-    series = chart_add_series(chart, NULL, NULL);
+    series = chart_add_series(chart, NULL, NULL, 0);
 
     /* Configure the series using a syntax that is easier to define programmatically. */
     chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
@@ -87,13 +87,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_BAR_STACKED);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
@@ -116,13 +116,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_BAR_STACKED_PERCENT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
diff --git a/examples/chart_clustered.c b/examples/chart_clustered.c
index 1acf4d7b..ef88eeed 100644
--- a/examples/chart_clustered.c
+++ b/examples/chart_clustered.c
@@ -71,15 +71,15 @@ int main() {
      */
     chart_add_series(chart,
                      "=Sheet1!$A$2:$B$6",
-                     "=Sheet1!$C$2:$C$6");
+                     "=Sheet1!$C$2:$C$6", 0);
 
     chart_add_series(chart,
                      "=Sheet1!$A$2:$B$6",
-                     "=Sheet1!$D$2:$D$6");
+                     "=Sheet1!$D$2:$D$6", 0);
 
     chart_add_series(chart,
                      "=Sheet1!$A$2:$B$6",
-                     "=Sheet1!$E$2:$E$6");
+                     "=Sheet1!$E$2:$E$6", 0);
 
     /* Set an Excel chart style. */
     chart_set_style(chart, 37);
diff --git a/examples/chart_column.c b/examples/chart_column.c
index 86ff701e..0f8fe79e 100644
--- a/examples/chart_column.c
+++ b/examples/chart_column.c
@@ -55,14 +55,14 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add a second series but leave the categories and values undefined. They
      * can be defined later using the alternative syntax shown below.  */
-    series = chart_add_series(chart, NULL, NULL);
+    series = chart_add_series(chart, NULL, NULL, 0);
 
     /* Configure the series using a syntax that is easier to define programmatically. */
     chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
@@ -87,13 +87,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_COLUMN_STACKED);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
@@ -116,13 +116,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_COLUMN_STACKED_PERCENT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
diff --git a/examples/chart_combined.c b/examples/chart_combined.c
new file mode 100644
index 00000000..f2793217
--- /dev/null
+++ b/examples/chart_combined.c
@@ -0,0 +1,146 @@
+/*
+ * An example of creating combined charts using the libxlsxwriter library.
+ *
+ * A combined chart is one that shows two chart types, such as a column chart
+ * combined with a line chart. They can share the same Y axis or have a
+ * secondary Y axis.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+/*
+ * Write some data to the worksheet.
+ */
+void write_worksheet_data(lxw_worksheet *worksheet, lxw_format *bold) {
+
+    int row, col;
+    uint8_t data[6][3] = {
+        /* Three columns of data. */
+        {2, 10, 30},
+        {3, 40, 60},
+        {4, 50, 70},
+        {5, 20, 50},
+        {6, 10, 40},
+        {7, 50, 30}
+    };
+
+    worksheet_write_string(worksheet, CELL("A1"), "Number",  bold);
+    worksheet_write_string(worksheet, CELL("B1"), "Batch 1", bold);
+    worksheet_write_string(worksheet, CELL("C1"), "Batch 2", bold);
+
+    for (row = 0; row < 6; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row + 1, col, data[row][col], NULL);
+}
+
+/*
+ * Create a worksheet with combined chart examples.
+ */
+int main() {
+
+    lxw_workbook     *workbook  = workbook_new("chart_combined.xlsx");
+    lxw_worksheet    *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart_series *series;
+
+    /* Add a bold format to use to highlight the header cells. */
+    lxw_format *bold = workbook_add_format(workbook);
+    format_set_bold(bold);
+
+    /* Write some data for the chart. */
+    write_worksheet_data(worksheet, bold);
+
+
+    /*
+     * Chart 1. Create a combined column and line chart with shared Y axis.
+     *
+     * In this example we will create a combined column and line chart.
+     * They will share the same X and Y axes.
+     */
+
+    /* Create a column chart - this will be the primary chart. */
+    lxw_chart *column_chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* Add the first series to the primary chart. */
+    series = chart_add_series(column_chart,
+        "=Sheet1!$A$2:$A$7",
+        "=Sheet1!$B$2:$B$7",
+        0);  /* Primary Y axis */
+    chart_series_set_name(series, "=Sheet1!$B$1");
+
+    /* Create a line chart - this will be the secondary (combined) chart. */
+    lxw_chart *line_chart = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* Add the first series to the secondary chart. */
+    series = chart_add_series(line_chart,
+        "=Sheet1!$A$2:$A$7",
+        "=Sheet1!$C$2:$C$7",
+        0);  /* Primary Y axis (shared with column chart) */
+    chart_series_set_name(series, "=Sheet1!$C$1");
+
+    /* Combine the charts. The line chart is overlaid on the column chart. */
+    chart_combine(column_chart, line_chart);
+
+    /* Add a chart title and axis labels. Note: these are set on the
+     * primary chart. */
+    chart_title_set_name(column_chart, "Combined chart - same Y axis");
+    chart_axis_set_name(column_chart->x_axis, "Test number");
+    chart_axis_set_name(column_chart->y_axis, "Sample length (mm)");
+
+    /* Insert the chart into the worksheet. */
+    worksheet_insert_chart(worksheet, CELL("E2"), column_chart);
+
+
+    /*
+     * Chart 2. Create a combined column and line chart with secondary Y axis.
+     *
+     * In this example we create a similar combined column and line chart
+     * except that the line chart has a secondary Y axis on the right side.
+     */
+
+    /* Create a column chart - this will be the primary chart. */
+    lxw_chart *column_chart2 = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* Add the first series to the primary chart. */
+    series = chart_add_series(column_chart2,
+        "=Sheet1!$A$2:$A$7",
+        "=Sheet1!$B$2:$B$7",
+        0);  /* Primary Y axis */
+    chart_series_set_name(series, "=Sheet1!$B$1");
+
+    /* Create a line chart - this will be the secondary (combined) chart. */
+    lxw_chart *line_chart2 = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* Add the first series to the secondary chart.
+     *
+     * Set y2_axis = 1 to place this series on the secondary Y axis.
+     * This tells the library to:
+     * 1. Use secondary axis IDs for this series
+     * 2. Write the secondary axis elements (Y2 on right, X2 hidden)
+     */
+    series = chart_add_series(line_chart2,
+        "=Sheet1!$A$2:$A$7",
+        "=Sheet1!$C$2:$C$7",
+        1);  /* y2_axis = 1: Use secondary Y axis */
+    chart_series_set_name(series, "=Sheet1!$C$1");
+
+    /* Combine the charts. */
+    chart_combine(column_chart2, line_chart2);
+
+    /* Add a chart title and axis labels. */
+    chart_title_set_name(column_chart2, "Combined chart - secondary Y axis");
+    chart_axis_set_name(column_chart2->x_axis, "Test number");
+    chart_axis_set_name(column_chart2->y_axis, "Sample length (mm)");
+
+    /* Configure the secondary Y axis (accessed via the primary chart).
+     * The secondary Y axis appears on the right side of the chart. */
+    chart_axis_set_name(column_chart2->y2_axis, "Target length (mm)");
+
+    /* Insert the chart into the worksheet. */
+    worksheet_insert_chart(worksheet, CELL("E18"), column_chart2);
+
+
+    return workbook_close(workbook);
+}
diff --git a/examples/chart_data_labels.c b/examples/chart_data_labels.c
index 8b70782a..acfe2b7f 100644
--- a/examples/chart_data_labels.c
+++ b/examples/chart_data_labels.c
@@ -59,7 +59,7 @@ int main() {
 
     /* Add a data series to the chart. */
     lxw_chart_series *series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                                       "=Sheet1!$B$2:$B$7");
+                                                       "=Sheet1!$B$2:$B$7", 0);
 
     /* Add the series data labels. */
     chart_series_set_labels(series);
@@ -81,7 +81,7 @@ int main() {
 
     /* Add a data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                     "=Sheet1!$B$2:$B$7");
+                                     "=Sheet1!$B$2:$B$7", 0);
 
     /* Add the series data labels. */
     chart_series_set_labels(series);
@@ -106,7 +106,7 @@ int main() {
 
     /* Add a data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                     "=Sheet1!$B$2:$B$7");
+                                     "=Sheet1!$B$2:$B$7", 0);
 
     /* Add the series data labels. */
     chart_series_set_labels(series);
@@ -131,7 +131,7 @@ int main() {
 
     /* Add a data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                     "=Sheet1!$B$2:$B$7");
+                                     "=Sheet1!$B$2:$B$7", 0);
 
     /* Add the series data labels. */
     chart_series_set_labels(series);
@@ -160,7 +160,7 @@ int main() {
 
     /* Add a data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                     "=Sheet1!$B$2:$B$7");
+                                     "=Sheet1!$B$2:$B$7", 0);
 
     /* Add the series data labels. */
     chart_series_set_labels(series);
@@ -204,7 +204,7 @@ int main() {
 
     /* Add a data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                     "=Sheet1!$B$2:$B$7");
+                                     "=Sheet1!$B$2:$B$7", 0);
 
     /* Add the series data labels. */
     chart_series_set_labels(series);
@@ -248,7 +248,7 @@ int main() {
 
     /* Add a data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                     "=Sheet1!$B$2:$B$7");
+                                     "=Sheet1!$B$2:$B$7", 0);
 
     lxw_chart_font font2 = {.color = LXW_COLOR_RED};
 
@@ -296,7 +296,7 @@ int main() {
 
     /* Add a data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                     "=Sheet1!$B$2:$B$7");
+                                     "=Sheet1!$B$2:$B$7", 0);
 
     /* Add the series data labels. */
     chart_series_set_labels(series);
@@ -339,7 +339,7 @@ int main() {
 
     /* Add a data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$2:$A$7",
-                                     "=Sheet1!$B$2:$B$7");
+                                     "=Sheet1!$B$2:$B$7", 0);
 
     /* Add the series data labels. */
     chart_series_set_labels(series);
diff --git a/examples/chart_data_table.c b/examples/chart_data_table.c
index 94a1226f..cfc6c74a 100644
--- a/examples/chart_data_table.c
+++ b/examples/chart_data_table.c
@@ -56,14 +56,14 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add a second series but leave the categories and values undefined. They
      * can be defined later using the alternative syntax shown below.  */
-    series = chart_add_series(chart, NULL, NULL);
+    series = chart_add_series(chart, NULL, NULL, 0);
 
     /* Configure the series using a syntax that is easier to define programmatically. */
     chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
@@ -88,13 +88,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
diff --git a/examples/chart_data_tools.c b/examples/chart_data_tools.c
index 2b7661a0..dc5852f8 100644
--- a/examples/chart_data_tools.c
+++ b/examples/chart_data_tools.c
@@ -60,8 +60,8 @@ int main() {
     chart_title_set_name(chart, "Chart with High-Low Lines");
 
     /* Add the first series to the chart. */
-    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
-    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
+    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Add high-low lines to the chart. */
     chart_set_high_low_lines(chart, NULL);
@@ -79,8 +79,8 @@ int main() {
     chart_title_set_name(chart, "Chart with Drop Lines");
 
     /* Add the first series to the chart. */
-    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
-    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
+    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Add drop lines to the chart. */
     chart_set_drop_lines(chart, NULL);
@@ -98,8 +98,8 @@ int main() {
     chart_title_set_name(chart, "Chart with Up-Down bars");
 
     /* Add the first series to the chart. */
-    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
-    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
+    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Add Up-Down bars to the chart. */
     chart_set_up_down_bars(chart);
@@ -117,8 +117,8 @@ int main() {
     chart_title_set_name(chart, "Chart with Up-Down bars");
 
     /* Add the first series to the chart. */
-    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
-    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
+    chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Add Up-Down bars to the chart, with formatting. */
     lxw_chart_line line      = {.color = LXW_COLOR_BLACK};
@@ -140,8 +140,8 @@ int main() {
     chart_title_set_name(chart, "Chart with Data Labels and Markers");
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
-    chart_add_series(         chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
+    chart_add_series(         chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Add series markers. */
     chart_series_set_marker_type(series, LXW_CHART_MARKER_CIRCLE);
@@ -162,8 +162,8 @@ int main() {
     chart_title_set_name(chart, "Chart with Error Bars");
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
-    chart_add_series(         chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
+    chart_add_series(         chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Add error bars to show Standard Error. */
     chart_series_set_error_bars(series->y_error_bars,
@@ -185,8 +185,8 @@ int main() {
     chart_title_set_name(chart, "Chart with a Trendline");
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
-    chart_add_series(         chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
+    chart_add_series(         chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Add a polynomial trendline. */
     lxw_chart_line poly_line = {.color     = LXW_COLOR_GRAY,
diff --git a/examples/chart_doughnut.c b/examples/chart_doughnut.c
index be67df42..b8b976eb 100644
--- a/examples/chart_doughnut.c
+++ b/examples/chart_doughnut.c
@@ -54,7 +54,7 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "Doughnut sales data");
@@ -75,7 +75,7 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "Doughnut sales data");
@@ -112,7 +112,7 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "Doughnut sales data");
@@ -135,7 +135,7 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "Doughnut sales data");
diff --git a/examples/chart_fonts.c b/examples/chart_fonts.c
index ecd9c2d5..b3b37674 100644
--- a/examples/chart_fonts.c
+++ b/examples/chart_fonts.c
@@ -27,7 +27,7 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_LINE);
 
     /* Configure the chart. */
-    chart_add_series(chart, NULL, "Sheet1!$A$1:$A$6");
+    chart_add_series(chart, NULL, "Sheet1!$A$1:$A$6", 0);
 
     /* Create some fonts to use in the chart.  */
     lxw_chart_font font1 = {.name = "Calibri", .color = LXW_COLOR_BLUE};
diff --git a/examples/chart_gauge.c b/examples/chart_gauge.c
new file mode 100644
index 00000000..f0523543
--- /dev/null
+++ b/examples/chart_gauge.c
@@ -0,0 +1,105 @@
+/*
+ * An example of creating a Gauge Chart in Excel with libxlsxwriter.
+ *
+ * A Gauge Chart isn't a native chart type in Excel. It is constructed by
+ * combining a doughnut chart and a pie chart and by using some non-filled
+ * elements. This example follows the following online example of how to create
+ * a Gauge Chart in Excel: https://www.excel-easy.com/examples/gauge-chart.html
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("chart_gauge.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart_series *series;
+
+    /* Add some data for the Doughnut and Pie charts. This is set up so the
+     * gauge goes from 0-100. It is initially set at 75%. */
+    worksheet_write_string(worksheet, 1, 7, "Donut", NULL);
+    worksheet_write_number(worksheet, 2, 7, 25, NULL);
+    worksheet_write_number(worksheet, 3, 7, 50, NULL);
+    worksheet_write_number(worksheet, 4, 7, 25, NULL);
+    worksheet_write_number(worksheet, 5, 7, 100, NULL);
+
+    worksheet_write_string(worksheet, 1, 8, "Pie", NULL);
+    worksheet_write_number(worksheet, 2, 8, 75, NULL);
+    worksheet_write_number(worksheet, 3, 8, 1, NULL);
+    worksheet_write_formula(worksheet, 4, 8, "=200-I4-I3", NULL);
+
+    /* Create a doughnut chart for the background of the gauge. */
+    lxw_chart *chart_doughnut = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT);
+
+    /* Add the doughnut chart series with colors for the segments. */
+    series = chart_add_series(chart_doughnut,
+                              NULL, "=Sheet1!$H$3:$H$6", 0);
+    chart_series_set_name(series, "=Sheet1!$H$2");
+
+    /* Create fills for the doughnut segments: green, yellow, red, and no fill. */
+    lxw_chart_fill green_fill  = {.color = 0x00B050};
+    lxw_chart_fill yellow_fill = {.color = 0xFFFF00};
+    lxw_chart_fill red_fill    = {.color = 0xFF0000};
+    lxw_chart_fill no_fill     = {.none = LXW_TRUE};
+
+    lxw_chart_point green_point  = {.fill = &green_fill};
+    lxw_chart_point yellow_point = {.fill = &yellow_fill};
+    lxw_chart_point red_point    = {.fill = &red_fill};
+    lxw_chart_point empty_point  = {.fill = &no_fill};
+
+    lxw_chart_point *doughnut_points[] = {&green_point,
+                                          &yellow_point,
+                                          &red_point,
+                                          &empty_point,
+                                          NULL};
+
+    chart_series_set_points(series, doughnut_points);
+
+    /* Rotate the doughnut chart so the gauge segments are above the horizontal. */
+    chart_set_rotation(chart_doughnut, 270);
+
+    /* Turn off the chart legend. */
+    chart_legend_set_position(chart_doughnut, LXW_CHART_LEGEND_NONE);
+
+    /* Turn off the chart fill and border. */
+    lxw_chart_fill chart_no_fill = {.none = LXW_TRUE};
+    lxw_chart_line chart_no_line = {.none = LXW_TRUE};
+    chart_chartarea_set_fill(chart_doughnut, &chart_no_fill);
+    chart_chartarea_set_line(chart_doughnut, &chart_no_line);
+
+    /* Create a pie chart for the needle of the gauge. */
+    lxw_chart *chart_pie = workbook_add_chart(workbook, LXW_CHART_PIE);
+
+    /* Add the pie chart series for the needle. */
+    series = chart_add_series(chart_pie,
+                              NULL, "=Sheet1!$I$3:$I$6", 0);
+    chart_series_set_name(series, "=Sheet1!$I$2");
+
+    /* Create fills for the pie segments: no fill, black (needle), no fill. */
+    lxw_chart_fill black_fill = {.color = 0x000000};
+
+    lxw_chart_point pie_empty1 = {.fill = &no_fill};
+    lxw_chart_point pie_needle = {.fill = &black_fill};
+    lxw_chart_point pie_empty2 = {.fill = &no_fill};
+
+    lxw_chart_point *pie_points[] = {&pie_empty1,
+                                     &pie_needle,
+                                     &pie_empty2,
+                                     NULL};
+
+    chart_series_set_points(series, pie_points);
+
+    /* Rotate the pie chart to align the needle with the doughnut gauge. */
+    chart_set_rotation(chart_pie, 270);
+
+    /* Combine the doughnut and pie charts. */
+    chart_combine(chart_doughnut, chart_pie);
+
+    /* Insert the combined chart into the worksheet. */
+    worksheet_insert_chart(worksheet, CELL("A1"), chart_doughnut);
+
+    return workbook_close(workbook);
+}
diff --git a/examples/chart_gradient.c b/examples/chart_gradient.c
new file mode 100644
index 00000000..14d081a5
--- /dev/null
+++ b/examples/chart_gradient.c
@@ -0,0 +1,97 @@
+/*
+ * An example of creating an Excel column chart with gradient fills using
+ * libxlsxwriter.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("chart_gradient.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart_series *series;
+
+    /* Add a bold format for the headers. */
+    lxw_format *bold = workbook_add_format(workbook);
+    format_set_bold(bold);
+
+    /* Write the worksheet data that the chart will refer to. */
+    worksheet_write_string(worksheet, 0, 0, "Number",  bold);
+    worksheet_write_string(worksheet, 0, 1, "Batch 1", bold);
+    worksheet_write_string(worksheet, 0, 2, "Batch 2", bold);
+
+    worksheet_write_number(worksheet, 1, 0, 2, NULL);
+    worksheet_write_number(worksheet, 2, 0, 3, NULL);
+    worksheet_write_number(worksheet, 3, 0, 4, NULL);
+    worksheet_write_number(worksheet, 4, 0, 5, NULL);
+    worksheet_write_number(worksheet, 5, 0, 6, NULL);
+    worksheet_write_number(worksheet, 6, 0, 7, NULL);
+
+    worksheet_write_number(worksheet, 1, 1, 10, NULL);
+    worksheet_write_number(worksheet, 2, 1, 40, NULL);
+    worksheet_write_number(worksheet, 3, 1, 50, NULL);
+    worksheet_write_number(worksheet, 4, 1, 20, NULL);
+    worksheet_write_number(worksheet, 5, 1, 10, NULL);
+    worksheet_write_number(worksheet, 6, 1, 50, NULL);
+
+    worksheet_write_number(worksheet, 1, 2, 30, NULL);
+    worksheet_write_number(worksheet, 2, 2, 60, NULL);
+    worksheet_write_number(worksheet, 3, 2, 70, NULL);
+    worksheet_write_number(worksheet, 4, 2, 50, NULL);
+    worksheet_write_number(worksheet, 5, 2, 40, NULL);
+    worksheet_write_number(worksheet, 6, 2, 30, NULL);
+
+    /* Create a column chart. */
+    lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* Configure the first series with a gradient fill. */
+    series = chart_add_series(chart,
+                              "=Sheet1!$A$2:$A$7",
+                              "=Sheet1!$B$2:$B$7", 0);
+    chart_series_set_name(series, "=Sheet1!$B$1");
+
+    /* Set gradient: dark red to light red. */
+    lxw_chart_gradient_fill gradient1 = {
+        .type = LXW_CHART_GRADIENT_FILL_LINEAR,
+        .colors = {0x963735, 0xF1DCDB},
+        .num_stops = 2,
+    };
+    chart_series_set_gradient(series, &gradient1);
+
+    /* Configure the second series with a gradient fill. */
+    series = chart_add_series(chart,
+                              "=Sheet1!$A$2:$A$7",
+                              "=Sheet1!$C$2:$C$7", 0);
+    chart_series_set_name(series, "=Sheet1!$C$1");
+
+    /* Set gradient: dark orange to light orange. */
+    lxw_chart_gradient_fill gradient2 = {
+        .type = LXW_CHART_GRADIENT_FILL_LINEAR,
+        .colors = {0xE36C0A, 0xFCEADA},
+        .num_stops = 2,
+    };
+    chart_series_set_gradient(series, &gradient2);
+
+    /* Set a gradient fill for the plotarea. */
+    lxw_chart_gradient_fill plotarea_gradient = {
+        .type = LXW_CHART_GRADIENT_FILL_LINEAR,
+        .colors = {0xFFEFD1, 0xF0EBD5, 0xB69F66},
+        .num_stops = 3,
+    };
+    chart_plotarea_set_gradient(chart, &plotarea_gradient);
+
+    /* Add axis labels. */
+    chart_axis_set_name(chart->x_axis, "Test number");
+    chart_axis_set_name(chart->y_axis, "Sample length (mm)");
+
+    /* Turn off the chart legend. */
+    chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
+
+    /* Insert the chart into the worksheet. */
+    worksheet_insert_chart(worksheet, CELL("E2"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/examples/chart_line.c b/examples/chart_line.c
index 2094decc..6120340c 100644
--- a/examples/chart_line.c
+++ b/examples/chart_line.c
@@ -55,14 +55,14 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_LINE);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add a second series but leave the categories and values undefined. They
      * can be defined later using the alternative syntax shown below.  */
-    series = chart_add_series(chart, NULL, NULL);
+    series = chart_add_series(chart, NULL, NULL, 0);
 
     /* Configure the series using a syntax that is easier to define programmatically. */
     chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
@@ -87,13 +87,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_LINE_STACKED);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
@@ -116,13 +116,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_LINE_STACKED_PERCENT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
diff --git a/examples/chart_pareto.c b/examples/chart_pareto.c
new file mode 100644
index 00000000..1f277a62
--- /dev/null
+++ b/examples/chart_pareto.c
@@ -0,0 +1,102 @@
+/*
+ * An example of creating a Pareto chart with libxlsxwriter.
+ *
+ * A Pareto chart is a type of chart that combines a column chart with a line
+ * chart. The columns represent individual values in descending order, and the
+ * line represents the cumulative percentage.
+ *
+ * This example uses combined charts with a secondary Y axis.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("chart_pareto.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Add formats for the worksheet data. */
+    lxw_format *bold = workbook_add_format(workbook);
+    format_set_bold(bold);
+
+    lxw_format *percent_format = workbook_add_format(workbook);
+    format_set_num_format(percent_format, "0.0%");
+
+    /* Widen the columns for visibility. */
+    worksheet_set_column(worksheet, COLS("A:A"), 15, NULL);
+    worksheet_set_column(worksheet, COLS("B:C"), 10, NULL);
+
+    /* Add the worksheet data that the charts will refer to. */
+    worksheet_write_string(worksheet, 0, 0, "Reason",     bold);
+    worksheet_write_string(worksheet, 0, 1, "Number",     bold);
+    worksheet_write_string(worksheet, 0, 2, "Percentage", bold);
+
+    /* Reasons for lateness data. */
+    worksheet_write_string(worksheet, 1, 0, "Traffic", NULL);
+    worksheet_write_string(worksheet, 2, 0, "Child care", NULL);
+    worksheet_write_string(worksheet, 3, 0, "Public Transport", NULL);
+    worksheet_write_string(worksheet, 4, 0, "Weather", NULL);
+    worksheet_write_string(worksheet, 5, 0, "Overslept", NULL);
+    worksheet_write_string(worksheet, 6, 0, "Emergency", NULL);
+
+    /* Number of occurrences. */
+    worksheet_write_number(worksheet, 1, 1, 60, NULL);
+    worksheet_write_number(worksheet, 2, 1, 40, NULL);
+    worksheet_write_number(worksheet, 3, 1, 20, NULL);
+    worksheet_write_number(worksheet, 4, 1, 15, NULL);
+    worksheet_write_number(worksheet, 5, 1, 10, NULL);
+    worksheet_write_number(worksheet, 6, 1,  5, NULL);
+
+    /* Cumulative percentages. */
+    worksheet_write_number(worksheet, 1, 2, 0.400, percent_format);
+    worksheet_write_number(worksheet, 2, 2, 0.667, percent_format);
+    worksheet_write_number(worksheet, 3, 2, 0.800, percent_format);
+    worksheet_write_number(worksheet, 4, 2, 0.900, percent_format);
+    worksheet_write_number(worksheet, 5, 2, 0.967, percent_format);
+    worksheet_write_number(worksheet, 6, 2, 1.000, percent_format);
+
+    /* Create a new column chart. This will be the primary chart. */
+    lxw_chart *column_chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* Add a series for the column chart. */
+    chart_add_series(column_chart,
+                     "=Sheet1!$A$2:$A$7",
+                     "=Sheet1!$B$2:$B$7", 0);
+
+    /* Add a chart title. */
+    chart_title_set_name(column_chart, "Reasons for lateness");
+
+    /* Turn off the chart legend. */
+    chart_legend_set_position(column_chart, LXW_CHART_LEGEND_NONE);
+
+    /* Set the title and scale of the Y axes. */
+    chart_axis_set_name(column_chart->y_axis, "Respondents (number)");
+    chart_axis_set_min(column_chart->y_axis, 0);
+    chart_axis_set_max(column_chart->y_axis, 120);
+    chart_axis_set_max(column_chart->y2_axis, 1);
+
+    /* Create a new line chart. This will be the secondary chart. */
+    lxw_chart *line_chart = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* Mark the line chart as secondary so it uses the secondary axes. */
+    line_chart->is_secondary = LXW_TRUE;
+
+    /* Add a series for the line chart, on the secondary axis. */
+    lxw_chart_series *series = chart_add_series(line_chart,
+                                                "=Sheet1!$A$2:$A$7",
+                                                "=Sheet1!$C$2:$C$7", 1);
+
+    /* Add markers to the line series. */
+    chart_series_set_marker_type(series, LXW_CHART_MARKER_AUTOMATIC);
+
+    /* Combine the column and line charts. */
+    chart_combine(column_chart, line_chart);
+
+    /* Insert the chart into the worksheet. */
+    worksheet_insert_chart(worksheet, CELL("F2"), column_chart);
+
+    return workbook_close(workbook);
+}
diff --git a/examples/chart_pattern.c b/examples/chart_pattern.c
index 1cb2b498..b0b7c694 100644
--- a/examples/chart_pattern.c
+++ b/examples/chart_pattern.c
@@ -37,8 +37,8 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
 
     /* Configure the chart. */
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "Sheet1!$A$2:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "Sheet1!$B$2:$B$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "Sheet1!$A$2:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "Sheet1!$B$2:$B$5", 0);
 
     chart_series_set_name(series1, "=Sheet1!$A$1");
     chart_series_set_name(series2, "=Sheet1!$B$1");
diff --git a/examples/chart_pie.c b/examples/chart_pie.c
index 2df4652d..53da939a 100644
--- a/examples/chart_pie.c
+++ b/examples/chart_pie.c
@@ -54,7 +54,7 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_PIE);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "Pie sales data");
@@ -75,7 +75,7 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_PIE);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "Pie sales data");
@@ -112,7 +112,7 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_PIE);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$4", "=Sheet1!$B$2:$B$4", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "Pie sales data");
diff --git a/examples/chart_pie_colors.c b/examples/chart_pie_colors.c
index cc3ff73c..f6cc1497 100644
--- a/examples/chart_pie_colors.c
+++ b/examples/chart_pie_colors.c
@@ -35,7 +35,7 @@ int main() {
 
     /* Add the data series to the chart. */
     series = chart_add_series(chart, "=Sheet1!$A$1:$A$2",
-                                     "=Sheet1!$B$1:$B$2");
+                                     "=Sheet1!$B$1:$B$2", 0);
 
     /* Create some fills for the chart points/segments. */
     lxw_chart_fill red_fill     = {.color = LXW_COLOR_RED  };
diff --git a/examples/chart_radar.c b/examples/chart_radar.c
index f9fdf4bc..21375361 100644
--- a/examples/chart_radar.c
+++ b/examples/chart_radar.c
@@ -55,14 +55,14 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_RADAR);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add a second series but leave the categories and values undefined. They
      * can be defined later using the alternative syntax shown below.  */
-    series = chart_add_series(chart, NULL, NULL);
+    series = chart_add_series(chart, NULL, NULL, 0);
 
     /* Configure the series using a syntax that is easier to define programmatically. */
     chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
@@ -86,13 +86,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_RADAR_WITH_MARKERS);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
@@ -113,13 +113,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_RADAR_FILLED);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
diff --git a/examples/chart_scatter.c b/examples/chart_scatter.c
index 1f9c5429..d93af2df 100644
--- a/examples/chart_scatter.c
+++ b/examples/chart_scatter.c
@@ -55,14 +55,14 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_SCATTER);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add a second series but leave the categories and values undefined. They
      * can be defined later using the alternative syntax shown below.  */
-    series = chart_add_series(chart, NULL, NULL);
+    series = chart_add_series(chart, NULL, NULL, 0);
 
     /* Configure the series using a syntax that is easier to define programmatically. */
     chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
@@ -88,13 +88,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_SCATTER_STRAIGHT_WITH_MARKERS);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
@@ -118,13 +118,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_SCATTER_STRAIGHT);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
@@ -148,13 +148,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_SCATTER_SMOOTH_WITH_MARKERS);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
@@ -178,13 +178,13 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_SCATTER_SMOOTH);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add the second series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7", 0);
 
     /* Set the name for the series instead of the default "Series 2". */
     chart_series_set_name(series, "=Sheet1!$C$1");
diff --git a/examples/chart_secondary_axis.c b/examples/chart_secondary_axis.c
new file mode 100644
index 00000000..c227c3e9
--- /dev/null
+++ b/examples/chart_secondary_axis.c
@@ -0,0 +1,84 @@
+/*
+ * An example of creating an Excel line chart with a secondary axis using
+ * the libxlsxwriter library.
+ *
+ * A secondary Y axis allows you to display two series with different scales
+ * on the same chart. The secondary Y axis appears on the right side of the
+ * chart.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+
+int main() {
+
+    lxw_workbook     *workbook  = workbook_new("chart_secondary_axis.xlsx");
+    lxw_worksheet    *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart_series *series;
+
+    /* Add a bold format for the headings. */
+    lxw_format *bold = workbook_add_format(workbook);
+    format_set_bold(bold);
+
+    /* Write the worksheet data that the chart will refer to. */
+    worksheet_write_string(worksheet, CELL("A1"), "Aliens", bold);
+    worksheet_write_string(worksheet, CELL("B1"), "Humans", bold);
+
+    /* Data for the "Aliens" series - small scale (2-7). */
+    worksheet_write_number(worksheet, 1, 0, 2, NULL);
+    worksheet_write_number(worksheet, 2, 0, 3, NULL);
+    worksheet_write_number(worksheet, 3, 0, 4, NULL);
+    worksheet_write_number(worksheet, 4, 0, 5, NULL);
+    worksheet_write_number(worksheet, 5, 0, 6, NULL);
+    worksheet_write_number(worksheet, 6, 0, 7, NULL);
+
+    /* Data for the "Humans" series - larger scale (10-50). */
+    worksheet_write_number(worksheet, 1, 1, 10, NULL);
+    worksheet_write_number(worksheet, 2, 1, 40, NULL);
+    worksheet_write_number(worksheet, 3, 1, 50, NULL);
+    worksheet_write_number(worksheet, 4, 1, 20, NULL);
+    worksheet_write_number(worksheet, 5, 1, 10, NULL);
+    worksheet_write_number(worksheet, 6, 1, 50, NULL);
+
+    /* Create a line chart. */
+    lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* Add the first series to the SECONDARY Y axis (y2_axis = 1).
+     *
+     * When y2_axis is set to 1 (LXW_TRUE), the series will be plotted
+     * against the secondary Y axis on the right side of the chart.
+     * This is useful when you have data with different scales.
+     */
+    series = chart_add_series(chart,
+        NULL,
+        "=Sheet1!$A$2:$A$7",
+        1);  /* y2_axis = 1: Use secondary Y axis */
+    chart_series_set_name(series, "=Sheet1!$A$1");
+
+    /* Add the second series to the PRIMARY Y axis (y2_axis = 0). */
+    series = chart_add_series(chart,
+        NULL,
+        "=Sheet1!$B$2:$B$7",
+        0);  /* y2_axis = 0: Use primary Y axis */
+    chart_series_set_name(series, "=Sheet1!$B$1");
+
+    /* Configure the chart legend position. */
+    chart_legend_set_position(chart, LXW_CHART_LEGEND_RIGHT);
+
+    /* Add a chart title and axis labels. */
+    chart_title_set_name(chart, "Survey results");
+    chart_axis_set_name(chart->x_axis, "Days");
+    chart_axis_set_name(chart->y_axis, "Population");
+    chart_axis_set_name(chart->y2_axis, "Laser wounds");
+
+    /* Hide the major gridlines on the primary Y axis for clarity. */
+    chart_axis_major_gridlines_set_visible(chart->y_axis, LXW_FALSE);
+
+    /* Insert the chart into the worksheet. */
+    worksheet_insert_chart(worksheet, CELL("D2"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/examples/chart_stock.c b/examples/chart_stock.c
new file mode 100644
index 00000000..c8bb2da0
--- /dev/null
+++ b/examples/chart_stock.c
@@ -0,0 +1,66 @@
+/*
+ * An example of creating Excel Stock charts with libxlsxwriter.
+ *
+ * Stock charts display High-Low-Close data and are suitable for financial
+ * and other data that shows variation over time.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("chart_stock.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_STOCK);
+
+    /* Add a bold format for the headers. */
+    lxw_format *bold = workbook_add_format(workbook);
+    format_set_bold(bold);
+
+    /* Add a date format for the date column. */
+    lxw_format *date_format = workbook_add_format(workbook);
+    format_set_num_format(date_format, "dd/mm/yyyy");
+
+    /* Add the worksheet data that the chart will refer to. */
+    /* Dates as Excel serial numbers (Jan 1-5, 2007). */
+    double dates[5] = {39083, 39084, 39085, 39086, 39087};
+    double high[5]  = {27.2, 25.03, 19.05, 20.34, 18.5};
+    double low[5]   = {23.49, 19.55, 15.12, 17.84, 16.34};
+    double close[5] = {25.45, 23.05, 17.32, 20.45, 17.34};
+
+    /* Write the column headers. */
+    worksheet_write_string(worksheet, 0, 0, "Date",  bold);
+    worksheet_write_string(worksheet, 0, 1, "High",  bold);
+    worksheet_write_string(worksheet, 0, 2, "Low",   bold);
+    worksheet_write_string(worksheet, 0, 3, "Close", bold);
+
+    /* Write the data columns. */
+    for (int row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row + 1, 0, dates[row], date_format);
+        worksheet_write_number(worksheet, row + 1, 1, high[row], NULL);
+        worksheet_write_number(worksheet, row + 1, 2, low[row], NULL);
+        worksheet_write_number(worksheet, row + 1, 3, close[row], NULL);
+    }
+
+    /* Widen the columns for visibility. */
+    worksheet_set_column(worksheet, COLS("A:D"), 11, NULL);
+
+    /* Add a series for each of the High-Low-Close columns. Stock charts
+     * should have 3 series (High-Low-Close) or 4 series (Open-High-Low-Close). */
+    chart_add_series(chart, "=Sheet1!$A$2:$A$6", "=Sheet1!$B$2:$B$6", 0);
+    chart_add_series(chart, "=Sheet1!$A$2:$A$6", "=Sheet1!$C$2:$C$6", 0);
+    chart_add_series(chart, "=Sheet1!$A$2:$A$6", "=Sheet1!$D$2:$D$6", 0);
+
+    /* Add a chart title and axis labels. */
+    chart_title_set_name(chart, "High-Low-Close");
+    chart_axis_set_name(chart->x_axis, "Date");
+    chart_axis_set_name(chart->y_axis, "Share price");
+
+    /* Insert the chart into the worksheet. */
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/examples/chart_styles.c b/examples/chart_styles.c
index 4a851216..f1dac5cb 100644
--- a/examples/chart_styles.c
+++ b/examples/chart_styles.c
@@ -38,7 +38,7 @@ int main() {
                 chart = workbook_add_chart(workbook, chart_types[chart_num]);
                 snprintf(chart_title, 32, "Style %d", style_num);
 
-                chart_add_series(chart, NULL, "=Data!$A$1:$A$6");
+                chart_add_series(chart, NULL, "=Data!$A$1:$A$6", 0);
                 chart_title_set_name(chart, chart_title);
                 chart_set_style(chart, style_num);
 
diff --git a/examples/chart_working_with_example.c b/examples/chart_working_with_example.c
index 6344207d..4b572d26 100644
--- a/examples/chart_working_with_example.c
+++ b/examples/chart_working_with_example.c
@@ -29,7 +29,7 @@ int main() {
     chart = workbook_add_chart(workbook, LXW_CHART_LINE);
 
     /* Configure the chart. */
-    series = chart_add_series(chart, NULL, "Sheet1!$A$1:$A$6");
+    series = chart_add_series(chart, NULL, "Sheet1!$A$1:$A$6", 0);
 
     (void)series; /* Do something with series in the real examples. */
 
diff --git a/examples/chartsheet.c b/examples/chartsheet.c
index 7896badd..6af50de5 100644
--- a/examples/chartsheet.c
+++ b/examples/chartsheet.c
@@ -53,14 +53,14 @@ int main() {
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_BAR);
 
     /* Add the first series to the chart. */
-    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7");
+    series = chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$B$2:$B$7", 0);
 
     /* Set the name for the series instead of the default "Series 1". */
     chart_series_set_name(series, "=Sheet1!$B$1");
 
     /* Add a second series but leave the categories and values undefined. They
      * can be defined later using the alternative syntax shown below.  */
-    series = chart_add_series(chart, NULL, NULL);
+    series = chart_add_series(chart, NULL, NULL, 0);
 
     /* Configure the series using a syntax that is easier to define programmatically. */
     chart_series_set_categories(series, "Sheet1", 1, 0, 6, 0); /* "=Sheet1!$A$2:$A$7" */
diff --git a/examples/checkbox.c b/examples/checkbox.c
new file mode 100644
index 00000000..19e39b89
--- /dev/null
+++ b/examples/checkbox.c
@@ -0,0 +1,32 @@
+/*
+ * An example of inserting checkboxes into a worksheet using the
+ * libxlsxwriter library.
+ *
+ * Checkboxes in Excel are a feature of Excel 365 versions from 2024 onwards.
+ * They are boolean values displayed as checkboxes in the cells.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("checkbox.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Widen the column for clarity. */
+    worksheet_set_column(worksheet, 0, 0, 15, NULL);
+
+    /* Write some checkboxes with different states. */
+    worksheet_insert_checkbox(worksheet, 0, 0, LXW_FALSE);
+    worksheet_insert_checkbox(worksheet, 1, 0, LXW_TRUE);
+    worksheet_insert_checkbox(worksheet, 2, 0, LXW_FALSE);
+    worksheet_insert_checkbox(worksheet, 3, 0, LXW_TRUE);
+    worksheet_insert_checkbox(worksheet, 4, 0, LXW_TRUE);
+
+    workbook_close(workbook);
+
+    return 0;
+}
diff --git a/examples/colors.c b/examples/colors.c
new file mode 100644
index 00000000..78b04e8c
--- /dev/null
+++ b/examples/colors.c
@@ -0,0 +1,77 @@
+/*
+ * A demonstration of the available colors and how to use them in
+ * libxlsxwriter.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("colors.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Set the column width for clarity. */
+    worksheet_set_column(worksheet, 0, 0, 16, NULL);
+    worksheet_set_column(worksheet, 1, 1, 10, NULL);
+
+    /* Define some named colors with their RGB values. */
+    struct {
+        const char *name;
+        lxw_color_t color;
+    } named_colors[] = {
+        {"Black",   LXW_COLOR_BLACK},
+        {"Blue",    LXW_COLOR_BLUE},
+        {"Brown",   LXW_COLOR_BROWN},
+        {"Cyan",    LXW_COLOR_CYAN},
+        {"Gray",    LXW_COLOR_GRAY},
+        {"Green",   LXW_COLOR_GREEN},
+        {"Lime",    LXW_COLOR_LIME},
+        {"Magenta", LXW_COLOR_MAGENTA},
+        {"Navy",    LXW_COLOR_NAVY},
+        {"Orange",  LXW_COLOR_ORANGE},
+        {"Pink",    LXW_COLOR_PINK},
+        {"Purple",  LXW_COLOR_PURPLE},
+        {"Red",     LXW_COLOR_RED},
+        {"Silver",  LXW_COLOR_SILVER},
+        {"White",   LXW_COLOR_WHITE},
+        {"Yellow",  LXW_COLOR_YELLOW},
+    };
+
+    int num_colors = sizeof(named_colors) / sizeof(named_colors[0]);
+
+    /* Write the named colors. */
+    for (int row = 0; row < num_colors; row++) {
+        lxw_format *color_format = workbook_add_format(workbook);
+        format_set_bg_color(color_format, named_colors[row].color);
+
+        worksheet_write_string(worksheet, row, 0, named_colors[row].name, NULL);
+        worksheet_write_blank(worksheet, row, 1, color_format);
+    }
+
+    /* Write some user-defined RGB colors. */
+    struct {
+        const char *name;
+        lxw_color_t color;
+    } user_colors[] = {
+        {"#FF7F50", 0xFF7F50},  /* Coral */
+        {"#DCDCDC", 0xDCDCDC},  /* Gainsboro */
+        {"#6495ED", 0x6495ED},  /* CornflowerBlue */
+        {"#DAA520", 0xDAA520},  /* GoldenRod */
+    };
+
+    int num_user_colors = sizeof(user_colors) / sizeof(user_colors[0]);
+
+    for (int i = 0; i < num_user_colors; i++) {
+        int row = num_colors + i;
+        lxw_format *color_format = workbook_add_format(workbook);
+        format_set_bg_color(color_format, user_colors[i].color);
+
+        worksheet_write_string(worksheet, row, 0, user_colors[i].name, NULL);
+        worksheet_write_blank(worksheet, row, 1, color_format);
+    }
+
+    return workbook_close(workbook);
+}
diff --git a/examples/right_to_left.c b/examples/right_to_left.c
new file mode 100644
index 00000000..a783fa57
--- /dev/null
+++ b/examples/right_to_left.c
@@ -0,0 +1,57 @@
+/*
+ * Example of how to use libxlsxwriter to change the default worksheet and
+ * cell text direction from left-to-right to right-to-left as required by
+ * some middle eastern versions of Excel.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook   = workbook_new("right_to_left.xlsx");
+    lxw_worksheet *worksheet1 = workbook_add_worksheet(workbook, NULL);
+    lxw_worksheet *worksheet2 = workbook_add_worksheet(workbook, NULL);
+
+    /* Create formats for text direction. */
+    lxw_format *format_left_to_right = workbook_add_format(workbook);
+    lxw_format *format_right_to_left = workbook_add_format(workbook);
+
+    /* Set reading order: 1 = left-to-right, 2 = right-to-left. */
+    format_set_reading_order(format_left_to_right, 1);
+    format_set_reading_order(format_right_to_left, 2);
+
+    /* Make the columns wider for clarity. */
+    worksheet_set_column(worksheet1, 0, 0, 25, NULL);
+    worksheet_set_column(worksheet2, 0, 0, 25, NULL);
+
+    /* Change the direction for worksheet2. */
+    worksheet_right_to_left(worksheet2);
+
+    /* Write some data to show the difference. */
+    /* Standard direction:         | A1 | B1 | C1 | ... */
+    worksheet_write_string(worksheet1, 0, 0,
+        "\xd9\x86\xd8\xb5 \xd8\xb9\xd8\xb1\xd8\xa8\xd9\x8a / English text",
+        NULL);  /* Arabic text / English text - Default direction */
+    worksheet_write_string(worksheet1, 1, 0,
+        "\xd9\x86\xd8\xb5 \xd8\xb9\xd8\xb1\xd8\xa8\xd9\x8a / English text",
+        format_left_to_right);
+    worksheet_write_string(worksheet1, 2, 0,
+        "\xd9\x86\xd8\xb5 \xd8\xb9\xd8\xb1\xd8\xa8\xd9\x8a / English text",
+        format_right_to_left);
+
+    /* Right to left direction:    ... | C1 | B1 | A1 | */
+    worksheet_write_string(worksheet2, 0, 0,
+        "\xd9\x86\xd8\xb5 \xd8\xb9\xd8\xb1\xd8\xa8\xd9\x8a / English text",
+        NULL);  /* Default direction */
+    worksheet_write_string(worksheet2, 1, 0,
+        "\xd9\x86\xd8\xb5 \xd8\xb9\xd8\xb1\xd8\xa8\xd9\x8a / English text",
+        format_left_to_right);
+    worksheet_write_string(worksheet2, 2, 0,
+        "\xd9\x86\xd8\xb5 \xd8\xb9\xd8\xb1\xd8\xa8\xd9\x8a / English text",
+        format_right_to_left);
+
+    return workbook_close(workbook);
+}
diff --git a/examples/sparklines.c b/examples/sparklines.c
new file mode 100644
index 00000000..6563c880
--- /dev/null
+++ b/examples/sparklines.c
@@ -0,0 +1,86 @@
+/*
+ * An example of creating Excel sparklines with libxlsxwriter.
+ *
+ * Sparklines are small charts that fit in a single cell and allow you to
+ * show trends in data at a glance.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("sparklines.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Set the column widths for the data and sparklines. */
+    worksheet_set_column(worksheet, COLS("A:F"), 12, NULL);
+    worksheet_set_column(worksheet, COLS("G:G"), 16, NULL);
+
+    /* Add some row headers. */
+    worksheet_write_string(worksheet, 0, 0, "Line", NULL);
+    worksheet_write_string(worksheet, 1, 0, "Column", NULL);
+    worksheet_write_string(worksheet, 2, 0, "Win/Loss", NULL);
+    worksheet_write_string(worksheet, 3, 0, "With options", NULL);
+    worksheet_write_string(worksheet, 4, 0, "Custom colors", NULL);
+
+    /* Write the sample data. */
+    int data[][5] = {
+        {-2, 2, 3, -1, 0},
+        {30, 20, 33, 20, 15},
+        {1, -1, -1, 1, -1},
+        {5, 10, 3, 8, 6},
+        {2, 4, 6, 8, 10},
+    };
+
+    for (int row = 0; row < 5; row++) {
+        for (int col = 0; col < 5; col++) {
+            worksheet_write_number(worksheet, row, col + 1, data[row][col], NULL);
+        }
+    }
+
+    /* Add a simple line sparkline. */
+    lxw_sparkline_options line_options = {
+        .range = "Sheet1!B1:F1",
+    };
+    worksheet_add_sparkline(worksheet, 0, 6, &line_options);
+
+    /* Add a column sparkline. */
+    lxw_sparkline_options column_options = {
+        .range = "Sheet1!B2:F2",
+        .type = LXW_SPARKLINE_COLUMN,
+    };
+    worksheet_add_sparkline(worksheet, 1, 6, &column_options);
+
+    /* Add a win/loss sparkline. */
+    lxw_sparkline_options winloss_options = {
+        .range = "Sheet1!B3:F3",
+        .type = LXW_SPARKLINE_WIN_LOSS,
+    };
+    worksheet_add_sparkline(worksheet, 2, 6, &winloss_options);
+
+    /* Add a sparkline with options: markers, high/low points, line weight. */
+    lxw_sparkline_options markers_options = {
+        .range = "Sheet1!B4:F4",
+        .markers = LXW_TRUE,
+        .high_point = LXW_TRUE,
+        .low_point = LXW_TRUE,
+        .first_point = LXW_TRUE,
+        .last_point = LXW_TRUE,
+        .weight = 1.5,
+    };
+    worksheet_add_sparkline(worksheet, 3, 6, &markers_options);
+
+    /* Add a sparkline with custom colors. */
+    lxw_sparkline_options color_options = {
+        .range = "Sheet1!B5:F5",
+        .series_color = 0x0000FF,   /* Blue line */
+        .markers = LXW_TRUE,
+        .markers_color = 0xFF0000,  /* Red markers */
+    };
+    worksheet_add_sparkline(worksheet, 4, 6, &color_options);
+
+    return workbook_close(workbook);
+}
diff --git a/examples/text_indent.c b/examples/text_indent.c
new file mode 100644
index 00000000..1ea626a7
--- /dev/null
+++ b/examples/text_indent.c
@@ -0,0 +1,32 @@
+/*
+ * A simple formatting example using libxlsxwriter.
+ *
+ * This program demonstrates the indentation cell format.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("text_indent.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Create formats with different indentation levels. */
+    lxw_format *indent1 = workbook_add_format(workbook);
+    lxw_format *indent2 = workbook_add_format(workbook);
+
+    format_set_indent(indent1, 1);
+    format_set_indent(indent2, 2);
+
+    /* Make the column wider for clarity. */
+    worksheet_set_column(worksheet, 0, 0, 40, NULL);
+
+    /* Write some indented text. */
+    worksheet_write_string(worksheet, 0, 0, "This text is indented 1 level",  indent1);
+    worksheet_write_string(worksheet, 1, 0, "This text is indented 2 levels", indent2);
+
+    return workbook_close(workbook);
+}
diff --git a/examples/textbox.c b/examples/textbox.c
new file mode 100644
index 00000000..84a522aa
--- /dev/null
+++ b/examples/textbox.c
@@ -0,0 +1,30 @@
+/*
+ * An example of inserting textboxes into a worksheet using the
+ * libxlsxwriter library.
+ *
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("textbox.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Insert a simple textbox with default size. */
+    worksheet_insert_textbox(worksheet, 1, 1, "This is a textbox");
+
+    /* Insert a textbox with custom size. */
+    lxw_textbox_options options = {.width = 256, .height = 100};
+    worksheet_insert_textbox_opt(worksheet, 8, 1, "A larger textbox", &options);
+
+    /* Insert a textbox with offset. */
+    lxw_textbox_options options2 = {.x_offset = 10, .y_offset = 10};
+    worksheet_insert_textbox_opt(worksheet, 15, 1, "Offset textbox", &options2);
+
+    workbook_close(workbook);
+
+    return 0;
+}
diff --git a/include/xlsxwriter.h b/include/xlsxwriter.h
index fb41018b..e395ad12 100644
--- a/include/xlsxwriter.h
+++ b/include/xlsxwriter.h
@@ -19,8 +19,8 @@
 #include "xlsxwriter/format.h"
 #include "xlsxwriter/utility.h"
 
-#define LXW_VERSION "1.2.3"
-#define LXW_VERSION_ID 123
-#define LXW_SOVERSION "10"
+#define LXW_VERSION "1.2.4"
+#define LXW_VERSION_ID 124
+#define LXW_SOVERSION "11"
 
 #endif /* __LXW_XLSXWRITER_H__ */
diff --git a/include/xlsxwriter/chart.h b/include/xlsxwriter/chart.h
index b4fc053b..3c6e2285 100644
--- a/include/xlsxwriter/chart.h
+++ b/include/xlsxwriter/chart.h
@@ -156,7 +156,10 @@ typedef enum lxw_chart_type {
     LXW_CHART_RADAR_WITH_MARKERS,
 
     /** Radar chart - filled. */
-    LXW_CHART_RADAR_FILLED
+    LXW_CHART_RADAR_FILLED,
+
+    /** Stock chart. */
+    LXW_CHART_STOCK
 } lxw_chart_type;
 
 /**
@@ -266,7 +269,10 @@ typedef enum lxw_chart_marker_type {
     LXW_CHART_MARKER_CIRCLE,
 
     /** Plus (+) marker type. */
-    LXW_CHART_MARKER_PLUS
+    LXW_CHART_MARKER_PLUS,
+
+    /** Dot marker type. */
+    LXW_CHART_MARKER_DOT
 } lxw_chart_marker_type;
 
 /**
@@ -485,7 +491,13 @@ typedef enum lxw_chart_axis_type {
     LXW_CHART_AXIS_TYPE_X,
 
     /** Chart Y axis. */
-    LXW_CHART_AXIS_TYPE_Y
+    LXW_CHART_AXIS_TYPE_Y,
+
+    /** Chart secondary X axis. */
+    LXW_CHART_AXIS_TYPE_X2,
+
+    /** Chart secondary Y axis. */
+    LXW_CHART_AXIS_TYPE_Y2
 } lxw_chart_axis_type;
 
 enum lxw_chart_subtype {
@@ -607,6 +619,21 @@ typedef enum lxw_chart_axis_tick_mark {
     LXW_CHART_AXIS_TICK_MARK_CROSSING
 } lxw_chart_tick_mark;
 
+/**
+ * @brief Time units for date axis major/minor units.
+ */
+typedef enum lxw_chart_axis_time_unit {
+
+    /** Time unit: Days. The default. */
+    LXW_CHART_AXIS_TIME_UNIT_DAYS,
+
+    /** Time unit: Months. */
+    LXW_CHART_AXIS_TIME_UNIT_MONTHS,
+
+    /** Time unit: Years. */
+    LXW_CHART_AXIS_TIME_UNIT_YEARS
+} lxw_chart_axis_time_unit;
+
 typedef struct lxw_series_range {
     char *formula;
     char *sheetname;
@@ -692,6 +719,51 @@ typedef struct lxw_chart_pattern {
 
 } lxw_chart_pattern;
 
+/**
+ * @brief Gradient fill types for chart elements.
+ */
+typedef enum lxw_chart_gradient_fill_type {
+
+    /** Linear gradient fill. */
+    LXW_CHART_GRADIENT_FILL_LINEAR,
+
+    /** Radial gradient fill. */
+    LXW_CHART_GRADIENT_FILL_RADIAL,
+
+    /** Rectangular gradient fill. */
+    LXW_CHART_GRADIENT_FILL_RECTANGULAR,
+
+    /** Path gradient fill. */
+    LXW_CHART_GRADIENT_FILL_PATH
+} lxw_chart_gradient_fill_type;
+
+/** Maximum number of gradient stops. */
+#define LXW_CHART_GRADIENT_MAX_STOPS 10
+
+/**
+ * @brief Struct to represent a chart gradient fill.
+ *
+ * See @ref chart_gradient_fills.
+ */
+typedef struct lxw_chart_gradient_fill {
+
+    /** The gradient fill type. See #lxw_chart_gradient_fill_type. */
+    uint8_t type;
+
+    /** Array of gradient colors. See @ref working_with_colors. */
+    lxw_color_t colors[LXW_CHART_GRADIENT_MAX_STOPS];
+
+    /** Array of gradient stop positions (0-100). */
+    uint8_t positions[LXW_CHART_GRADIENT_MAX_STOPS];
+
+    /** Number of gradient stops (2-10). */
+    uint8_t num_stops;
+
+    /** Angle for linear gradients (0-359). Default is 90. */
+    uint16_t angle;
+
+} lxw_chart_gradient_fill;
+
 /**
  * @brief Struct to represent a chart font.
  *
@@ -1040,6 +1112,7 @@ typedef struct lxw_chart_series {
     lxw_chart_line *line;
     lxw_chart_fill *fill;
     lxw_chart_pattern *pattern;
+    lxw_chart_gradient_fill *gradient;
     lxw_chart_marker *marker;
     lxw_chart_point *points;
     lxw_chart_custom_label *data_labels;
@@ -1065,6 +1138,7 @@ typedef struct lxw_chart_series {
     lxw_chart_line *label_line;
     lxw_chart_fill *label_fill;
     lxw_chart_pattern *label_pattern;
+    lxw_chart_gradient_fill *label_gradient;
 
     lxw_series_error_bars *x_error_bars;
     lxw_series_error_bars *y_error_bars;
@@ -1083,6 +1157,10 @@ typedef struct lxw_chart_series {
     lxw_chart_line *trendline_line;
     double trendline_intercept;
 
+    /* Secondary axis flags. */
+    uint8_t x2_axis;
+    uint8_t y2_axis;
+
     STAILQ_ENTRY (lxw_chart_series) list_pointers;
 
 } lxw_chart_series;
@@ -1140,6 +1218,8 @@ typedef struct lxw_chart_axis {
     double major_unit;
     uint8_t has_minor_unit;
     double minor_unit;
+    uint8_t major_unit_type;
+    uint8_t minor_unit_type;
 
     uint16_t interval_unit;
     uint16_t interval_tick;
@@ -1170,7 +1250,7 @@ typedef struct lxw_chart {
     uint8_t subtype;
     uint16_t series_index;
 
-    void (*write_chart_type)(struct lxw_chart *);
+    void (*write_chart_type)(struct lxw_chart *, uint8_t primary_axes);
     void (*write_plot_area)(struct lxw_chart *);
 
     /**
@@ -1185,6 +1265,18 @@ typedef struct lxw_chart {
      */
     lxw_chart_axis *y_axis;
 
+    /**
+     * A pointer to the chart secondary x2_axis object which can be used in
+     * functions that configure the secondary X axis.
+     */
+    lxw_chart_axis *x2_axis;
+
+    /**
+     * A pointer to the chart secondary y2_axis object which can be used in
+     * functions that configure the secondary Y axis.
+     */
+    lxw_chart_axis *y2_axis;
+
     lxw_chart_title title;
 
     uint32_t id;
@@ -1193,6 +1285,10 @@ typedef struct lxw_chart {
     uint32_t axis_id_3;
     uint32_t axis_id_4;
 
+    uint8_t has_secondary_axis;
+    struct lxw_chart *combined;
+    uint8_t is_secondary;
+
     uint8_t in_use;
     uint8_t chart_group;
     uint8_t cat_has_num_fmt;
@@ -1200,6 +1296,7 @@ typedef struct lxw_chart {
 
     uint8_t has_horiz_cat_axis;
     uint8_t has_horiz_val_axis;
+    uint8_t date_category;
 
     uint8_t style_id;
     uint16_t rotation;
@@ -1223,11 +1320,13 @@ typedef struct lxw_chart {
     lxw_chart_line *chartarea_line;
     lxw_chart_fill *chartarea_fill;
     lxw_chart_pattern *chartarea_pattern;
+    lxw_chart_gradient_fill *chartarea_gradient;
 
     lxw_chart_line *plotarea_line;
     lxw_chart_fill *plotarea_fill;
     lxw_chart_layout *plotarea_layout;
     lxw_chart_pattern *plotarea_pattern;
+    lxw_chart_gradient_fill *plotarea_gradient;
 
     uint8_t has_drop_lines;
     lxw_chart_line *drop_lines_line;
@@ -1278,6 +1377,8 @@ void lxw_chart_assemble_xml_file(lxw_chart *chart);
  * @param chart      Pointer to a lxw_chart instance to be configured.
  * @param categories The range of categories in the data series.
  * @param values     The range of values in the data series.
+ * @param y2_axis    (Optional) Set to 1 (LXW_TRUE) to plot the series on the
+ *                   secondary Y axis. Defaults to 0 (primary axis) if omitted.
  *
  * @return A lxw_chart_series object pointer.
  *
@@ -1289,7 +1390,11 @@ void lxw_chart_assemble_xml_file(lxw_chart *chart);
  * used to set the categories and values of the series:
  *
  * @code
+ *     // Add series on primary Y axis (y2_axis parameter is optional).
  *     chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$C$2:$C$7");
+ *
+ *     // Add series on secondary Y axis (explicit y2_axis = 1).
+ *     chart_add_series(chart, "=Sheet1!$A$2:$A$7", "=Sheet1!$D$2:$D$7", 1);
  * @endcode
  *
  *
@@ -1309,6 +1414,10 @@ void lxw_chart_assemble_xml_file(lxw_chart *chart);
  *    only mandatory option for every chart object. This parameter links the
  *    chart with the worksheet data that it displays.
  *
+ *  - `y2_axis`: (Optional) Set to 1 to plot the series on the secondary Y
+ *    axis (Y2). Defaults to 0 (primary axis) if omitted. The secondary axis
+ *    appears on the right side of the chart and can have a different scale.
+ *
  * The `categories` and `values` should be a string formula like
  * `"=Sheet1!$A$2:$A$7"` in the same way it is represented in Excel. This is
  * convenient when recreating a chart from an example in Excel but it is
@@ -1350,9 +1459,30 @@ void lxw_chart_assemble_xml_file(lxw_chart *chart);
  * @endcode
  *
  */
-lxw_chart_series *chart_add_series(lxw_chart *chart,
-                                   const char *categories,
-                                   const char *values);
+lxw_chart_series *chart_add_series_impl(lxw_chart *chart,
+                                        const char *categories,
+                                        const char *values, uint8_t y2_axis);
+
+/**
+ * @brief Macro wrapper for chart_add_series_impl with optional y2_axis parameter.
+ *
+ * This macro provides backward compatibility by defaulting y2_axis to 0
+ * (primary axis) when not specified.
+ *
+ * Usage:
+ * @code
+ *     // 3 arguments (y2_axis defaults to 0):
+ *     chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+ *
+ *     // 4 arguments (explicit y2_axis):
+ *     chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 1);
+ * @endcode
+ */
+#define chart_add_series(...) \
+    _LXW_CHART_ADD_SERIES(__VA_ARGS__, 0)
+
+#define _LXW_CHART_ADD_SERIES(chart, categories, values, y2_axis, ...) \
+    chart_add_series_impl((chart), (categories), (values), (y2_axis))
 
 /**
  * @brief Set a series "categories" range using row and column values.
@@ -1555,6 +1685,30 @@ void chart_series_set_invert_if_negative(lxw_chart_series *series);
 void chart_series_set_pattern(lxw_chart_series *series,
                               lxw_chart_pattern *pattern);
 
+/**
+ * @brief Set the gradient fill properties for a chart series.
+ *
+ * @param series   A series object created via `chart_add_series()`.
+ * @param gradient A #lxw_chart_gradient_fill struct.
+ *
+ * Set the gradient fill properties of a chart series:
+ *
+ * @code
+ *     lxw_chart_gradient_fill gradient = {
+ *         .type = LXW_CHART_GRADIENT_FILL_LINEAR,
+ *         .colors = {0x963735, 0xF1DCDB},
+ *         .num_stops = 2,
+ *         .angle = 90
+ *     };
+ *
+ *     chart_series_set_gradient(series, &gradient);
+ * @endcode
+ *
+ * For more information see #lxw_chart_gradient_fill_type and @ref chart_gradient_fills.
+ */
+void chart_series_set_gradient(lxw_chart_series *series,
+                               lxw_chart_gradient_fill * gradient);
+
 /**
  * @brief Set the data marker type for a series.
  *
@@ -2493,18 +2647,52 @@ void chart_series_set_error_bars_endcap(lxw_series_error_bars *error_bars,
 void chart_series_set_error_bars_line(lxw_series_error_bars *error_bars,
                                       lxw_chart_line *line);
 
+/**
+ * @brief Combine two charts into a single combined chart.
+ *
+ * @param chart          Pointer to the primary lxw_chart instance.
+ * @param combined_chart Pointer to the secondary lxw_chart to combine.
+ *
+ * The `%chart_combine()` function is used to combine two charts into a
+ * single chart, often with a shared category axis but different value axes.
+ * This is useful for showing two different data series with different
+ * scales on the same chart.
+ *
+ * @code
+ *     // Create primary and secondary charts.
+ *     lxw_chart *column_chart = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+ *     lxw_chart *line_chart   = workbook_add_chart(workbook, LXW_CHART_LINE);
+ *
+ *     // Add data series to each chart.
+ *     chart_add_series(column_chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+ *     chart_add_series(line_chart, NULL, "=Sheet1!$B$1:$B$5", 1);  // Secondary axis
+ *
+ *     // Combine the charts.
+ *     chart_combine(column_chart, line_chart);
+ *
+ *     // Insert the combined chart into the worksheet.
+ *     worksheet_insert_chart(worksheet, CELL("E2"), column_chart);
+ * @endcode
+ *
+ * Note: Only the primary chart should be inserted into the worksheet.
+ * The secondary chart is managed internally.
+ */
+void chart_combine(lxw_chart *chart, lxw_chart *combined_chart);
+
 /**
  * @brief           Get an axis pointer from a chart.
  *
  * @param chart     Pointer to a lxw_chart instance to be configured.
- * @param axis_type The axis type (X or Y): #lxw_chart_axis_type.
+ * @param axis_type The axis type (X, Y, X2 or Y2): #lxw_chart_axis_type.
  *
  * The `%chart_axis_get()` function returns a pointer to a chart axis based
  * on the  #lxw_chart_axis_type:
  *
  * @code
- *     lxw_chart_axis *x_axis = chart_axis_get(chart, LXW_CHART_AXIS_TYPE_X);
- *     lxw_chart_axis *y_axis = chart_axis_get(chart, LXW_CHART_AXIS_TYPE_Y);
+ *     lxw_chart_axis *x_axis  = chart_axis_get(chart, LXW_CHART_AXIS_TYPE_X);
+ *     lxw_chart_axis *y_axis  = chart_axis_get(chart, LXW_CHART_AXIS_TYPE_Y);
+ *     lxw_chart_axis *x2_axis = chart_axis_get(chart, LXW_CHART_AXIS_TYPE_X2);
+ *     lxw_chart_axis *y2_axis = chart_axis_get(chart, LXW_CHART_AXIS_TYPE_Y2);
  *
  *     // Use the axis pointer in other functions.
  *     chart_axis_major_gridlines_set_visible(x_axis, LXW_TRUE);
@@ -3121,6 +3309,74 @@ void chart_axis_set_major_unit(lxw_chart_axis *axis, double unit);
  */
 void chart_axis_set_minor_unit(lxw_chart_axis *axis, double unit);
 
+/**
+ * @brief Set the category axis as a date axis.
+ *
+ * @param axis A pointer to a chart #lxw_chart_axis object.
+ *
+ * Set the category axis type as a date axis. A date axis is similar to a
+ * category axis but it displays dates in chronological order rather than
+ * just as equal categories.
+ *
+ * @code
+ *     chart_axis_set_date_axis(chart->x_axis);
+ * @endcode
+ *
+ * This is often used with min/max, major/minor unit settings:
+ *
+ * @code
+ *     chart_axis_set_date_axis(chart->x_axis);
+ *     chart_axis_set_min(chart->x_axis, 41275);  // Date serial number
+ *     chart_axis_set_max(chart->x_axis, 41282);  // Date serial number
+ *     chart_axis_set_major_unit(chart->x_axis, 1);
+ *     chart_axis_set_major_unit_type(chart->x_axis, LXW_CHART_AXIS_TIME_UNIT_DAYS);
+ * @endcode
+ *
+ * **Axis types**: This function is applicable to category axes only.
+ *                 See @ref ww_charts_axes.
+ */
+void chart_axis_set_date_axis(lxw_chart_axis *axis);
+
+/**
+ * @brief Set the time unit type for the major unit of a date axis.
+ *
+ * @param axis A pointer to a chart #lxw_chart_axis object.
+ * @param type The time unit type: #lxw_chart_axis_time_unit.
+ *
+ * Set the time unit type for the major units of a date axis. The default is
+ * LXW_CHART_AXIS_TIME_UNIT_DAYS.
+ *
+ * @code
+ *     chart_axis_set_date_axis(chart->x_axis);
+ *     chart_axis_set_major_unit(chart->x_axis, 1);
+ *     chart_axis_set_major_unit_type(chart->x_axis, LXW_CHART_AXIS_TIME_UNIT_MONTHS);
+ * @endcode
+ *
+ * **Axis types**: This function is applicable to date axes only.
+ *                 See @ref ww_charts_axes.
+ */
+void chart_axis_set_major_unit_type(lxw_chart_axis *axis, uint8_t type);
+
+/**
+ * @brief Set the time unit type for the minor unit of a date axis.
+ *
+ * @param axis A pointer to a chart #lxw_chart_axis object.
+ * @param type The time unit type: #lxw_chart_axis_time_unit.
+ *
+ * Set the time unit type for the minor units of a date axis. The default is
+ * LXW_CHART_AXIS_TIME_UNIT_DAYS.
+ *
+ * @code
+ *     chart_axis_set_date_axis(chart->x_axis);
+ *     chart_axis_set_minor_unit(chart->x_axis, 1);
+ *     chart_axis_set_minor_unit_type(chart->x_axis, LXW_CHART_AXIS_TIME_UNIT_DAYS);
+ * @endcode
+ *
+ * **Axis types**: This function is applicable to date axes only.
+ *                 See @ref ww_charts_axes.
+ */
+void chart_axis_set_minor_unit_type(lxw_chart_axis *axis, uint8_t type);
+
 /**
  * @brief Set the display units for a value axis.
  *
@@ -3545,6 +3801,19 @@ void chart_chartarea_set_fill(lxw_chart *chart, lxw_chart_fill *fill);
 void chart_chartarea_set_pattern(lxw_chart *chart,
                                  lxw_chart_pattern *pattern);
 
+/**
+ * @brief Set the gradient fill properties for a chart area.
+ *
+ * @param chart    Pointer to a lxw_chart instance to be configured.
+ * @param gradient A #lxw_chart_gradient_fill struct.
+ *
+ * Set the gradient fill properties of a chart area.
+ *
+ * For more information see #lxw_chart_gradient_fill_type.
+ */
+void chart_chartarea_set_gradient(lxw_chart *chart,
+                                  lxw_chart_gradient_fill * gradient);
+
 /**
  * @brief Set the line properties for a plotarea.
  *
@@ -3605,6 +3874,19 @@ void chart_plotarea_set_fill(lxw_chart *chart, lxw_chart_fill *fill);
  */
 void chart_plotarea_set_pattern(lxw_chart *chart, lxw_chart_pattern *pattern);
 
+/**
+ * @brief Set the gradient fill properties for a chart plotarea.
+ *
+ * @param chart    Pointer to a lxw_chart instance to be configured.
+ * @param gradient A #lxw_chart_gradient_fill struct.
+ *
+ * Set the gradient fill properties of a chart plotarea.
+ *
+ * For more information see #lxw_chart_gradient_fill_type.
+ */
+void chart_plotarea_set_gradient(lxw_chart *chart,
+                                 lxw_chart_gradient_fill * gradient);
+
 /**
  * @brief Set the manual layout of the chart plotarea.
  *
@@ -3867,6 +4149,50 @@ void chart_set_series_overlap(lxw_chart *chart, int8_t overlap);
  */
 void chart_set_series_gap(lxw_chart *chart, uint16_t gap);
 
+/**
+ * @brief Set the overlap between series in a Bar/Column chart for the
+ *        secondary axis.
+ *
+ * @param chart   Pointer to a lxw_chart instance to be configured.
+ * @param overlap The overlap between the series. -100 to 100.
+ *
+ * The `%chart_set_series_overlap_y2()` function sets the overlap between
+ * series in Bar and Column charts for the secondary axis. It is identical
+ * to `chart_set_series_overlap()` but applies to the secondary Y axis.
+ *
+ * @code
+ *     chart_set_series_overlap_y2(chart, -27);
+ * @endcode
+ *
+ * The overlap value must be in the range `-100 <= overlap <= 100`.
+ * The default value is 0.
+ *
+ * This option is only available for Bar/Column charts with a secondary axis.
+ */
+void chart_set_series_overlap_y2(lxw_chart *chart, int8_t overlap);
+
+/**
+ * @brief Set the gap between series in a Bar/Column chart for the
+ *        secondary axis.
+ *
+ * @param chart Pointer to a lxw_chart instance to be configured.
+ * @param gap   The gap between the series. 0 to 500.
+ *
+ * The `%chart_set_series_gap_y2()` function sets the gap between series in
+ * Bar and Column charts for the secondary axis. It is identical to
+ * `chart_set_series_gap()` but applies to the secondary Y axis.
+ *
+ * @code
+ *     chart_set_series_gap_y2(chart, 251);
+ * @endcode
+ *
+ * The gap value must be in the range `0 <= gap <= 500`. The default value
+ * is 150.
+ *
+ * This option is only available for Bar/Column charts with a secondary axis.
+ */
+void chart_set_series_gap_y2(lxw_chart *chart, uint16_t gap);
+
 /**
  * @brief Set the option for displaying blank data in a chart.
  *
diff --git a/include/xlsxwriter/common.h b/include/xlsxwriter/common.h
index f7b281f6..2b793223 100644
--- a/include/xlsxwriter/common.h
+++ b/include/xlsxwriter/common.h
@@ -110,9 +110,6 @@ typedef enum lxw_error {
     /** Function string parameter is empty. */
     LXW_ERROR_PARAMETER_IS_EMPTY,
 
-    /** A #lxw_datetime parameter has a validation error. */
-    LXW_ERROR_DATETIME_VALIDATION,
-
     /** Worksheet name exceeds Excel's limit of 31 characters. */
     LXW_ERROR_SHEETNAME_LENGTH_EXCEEDED,
 
diff --git a/include/xlsxwriter/content_types.h b/include/xlsxwriter/content_types.h
index bbe967d5..c62a75ea 100644
--- a/include/xlsxwriter/content_types.h
+++ b/include/xlsxwriter/content_types.h
@@ -65,6 +65,7 @@ void lxw_ct_add_calc_chain(lxw_content_types *content_types);
 void lxw_ct_add_custom_properties(lxw_content_types *content_types);
 void lxw_ct_add_metadata(lxw_content_types *content_types);
 void lxw_ct_add_rich_value(lxw_content_types *content_types);
+void lxw_ct_add_feature_property_bag(lxw_content_types *content_types);
 
 /* Declarations required for unit testing. */
 #ifdef TESTING
diff --git a/include/xlsxwriter/drawing.h b/include/xlsxwriter/drawing.h
index 10105cb9..5b95a612 100644
--- a/include/xlsxwriter/drawing.h
+++ b/include/xlsxwriter/drawing.h
@@ -32,6 +32,42 @@ enum image_types {
     LXW_IMAGE_GIF
 };
 
+/**
+ * @brief Options for inserted textboxes.
+ *
+ */
+typedef struct lxw_textbox_options {
+
+    /** Width of the textbox in pixels. Default is 192. */
+    uint32_t width;
+
+    /** Height of the textbox in pixels. Default is 120. */
+    uint32_t height;
+
+    /** X offset from the cell in pixels. Default is 0. */
+    int32_t x_offset;
+
+    /** Y offset from the cell in pixels. Default is 0. */
+    int32_t y_offset;
+
+    /** X scale of the textbox. Default is 1.0. */
+    double x_scale;
+
+    /** Y scale of the textbox. Default is 1.0. */
+    double y_scale;
+
+    /** Object position/anchor: #lxw_object_position. Default is
+        LXW_OBJECT_MOVE_AND_SIZE. */
+    uint8_t object_position;
+
+    /** Alt text description of the textbox. */
+    const char *description;
+
+    /** Mark textbox as decorative. */
+    uint8_t decorative;
+
+} lxw_textbox_options;
+
 /* Coordinates used in a drawing object. */
 typedef struct lxw_drawing_coords {
     uint32_t col;
@@ -56,6 +92,7 @@ typedef struct lxw_drawing_object {
     char *description;
     char *tip;
     uint8_t decorative;
+    char *text;
 
     STAILQ_ENTRY (lxw_drawing_object) list_pointers;
 
diff --git a/include/xlsxwriter/feature_property_bag.h b/include/xlsxwriter/feature_property_bag.h
new file mode 100644
index 00000000..5e203c3a
--- /dev/null
+++ b/include/xlsxwriter/feature_property_bag.h
@@ -0,0 +1,58 @@
+/*
+ * libxlsxwriter
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ * feature_property_bag - A libxlsxwriter library for creating Excel XLSX
+ *                        featurePropertyBag files.
+ *
+ */
+#ifndef __LXW_FEATURE_PROPERTY_BAG_H__
+#define __LXW_FEATURE_PROPERTY_BAG_H__
+
+#include <stdint.h>
+
+#include "common.h"
+
+/* Feature property bag types. */
+#define LXW_FEATURE_BAG_NONE           0
+#define LXW_FEATURE_BAG_XF_COMPLEMENTS  1
+#define LXW_FEATURE_BAG_DXF_COMPLEMENTS 2
+
+/*
+ * Struct to represent a feature_property_bag.
+ */
+typedef struct lxw_feature_property_bag {
+
+    FILE *file;
+    uint8_t has_xf_complements;
+    uint8_t has_dxf_complements;
+
+} lxw_feature_property_bag;
+
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+extern "C" {
+#endif
+/* *INDENT-ON* */
+
+lxw_feature_property_bag *lxw_feature_property_bag_new(void);
+void lxw_feature_property_bag_free(lxw_feature_property_bag
+                                   *feature_property_bag);
+void lxw_feature_property_bag_assemble_xml_file(lxw_feature_property_bag
+                                                *self);
+
+/* Declarations required for unit testing. */
+#ifdef TESTING
+
+#endif /* TESTING */
+
+/* *INDENT-OFF* */
+#ifdef __cplusplus
+}
+#endif
+/* *INDENT-ON* */
+
+#endif /* __LXW_FEATURE_PROPERTY_BAG_H__ */
diff --git a/include/xlsxwriter/format.h b/include/xlsxwriter/format.h
index 471c27db..e16853ee 100644
--- a/include/xlsxwriter/format.h
+++ b/include/xlsxwriter/format.h
@@ -438,6 +438,8 @@ typedef struct lxw_format {
 
     uint8_t quote_prefix;
 
+    uint8_t checkbox;
+
     STAILQ_ENTRY (lxw_format) list_pointers;
 } lxw_format;
 
@@ -1333,6 +1335,26 @@ void format_set_diag_color(lxw_format *format, lxw_color_t color);
  */
 void format_set_quote_prefix(lxw_format *format);
 
+/**
+ * @brief Set the checkbox property for a cell format.
+ *
+ * @param format Pointer to a Format instance.
+ *
+ * Set the checkbox property of a format. This allows a boolean value to be
+ * displayed as a checkbox in Excel. It is generally easier to create a
+ * checkbox using the worksheet_insert_checkbox() function which
+ * automatically sets this property.
+ *
+ * @code
+ *     lxw_format *checkbox_format = workbook_add_format(workbook);
+ *     format_set_checkbox(checkbox_format);
+ *
+ *     worksheet_write_boolean(worksheet, 0, 0, 1, checkbox_format);
+ * @endcode
+ *
+ */
+void format_set_checkbox(lxw_format *format);
+
 void format_set_font_outline(lxw_format *format);
 void format_set_font_shadow(lxw_format *format);
 void format_set_font_scheme(lxw_format *format, const char *font_scheme);
diff --git a/include/xlsxwriter/packager.h b/include/xlsxwriter/packager.h
index 2e7f8a5a..244a459a 100644
--- a/include/xlsxwriter/packager.h
+++ b/include/xlsxwriter/packager.h
@@ -41,6 +41,7 @@
 #include "rich_value_rel.h"
 #include "rich_value_types.h"
 #include "rich_value_structure.h"
+#include "feature_property_bag.h"
 
 #define LXW_ZIP_BUFFER_SIZE (16384)
 
diff --git a/include/xlsxwriter/relationships.h b/include/xlsxwriter/relationships.h
index f989cc97..a5244dfe 100644
--- a/include/xlsxwriter/relationships.h
+++ b/include/xlsxwriter/relationships.h
@@ -62,6 +62,7 @@ void lxw_add_worksheet_relationship(lxw_relationships *self, const char *type,
                                     const char *target,
                                     const char *target_mode);
 void lxw_add_rich_value_relationship(lxw_relationships *self);
+void lxw_add_feature_property_bag_relationship(lxw_relationships *self);
 
 /* Declarations required for unit testing. */
 #ifdef TESTING
diff --git a/include/xlsxwriter/sparkline.h b/include/xlsxwriter/sparkline.h
new file mode 100644
index 00000000..e99469ac
--- /dev/null
+++ b/include/xlsxwriter/sparkline.h
@@ -0,0 +1,205 @@
+/*
+ * libxlsxwriter
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ */
+
+/**
+ * @file sparkline.h
+ *
+ * @brief Sparkline options and types for libxlsxwriter.
+ *
+ * Sparklines are small charts that fit in a single cell and allow you to
+ * show trends in data at a glance.
+ *
+ */
+
+#ifndef __LXW_SPARKLINE_H__
+#define __LXW_SPARKLINE_H__
+
+#include "common.h"
+
+/**
+ * @brief Sparkline types.
+ */
+typedef enum lxw_sparkline_type {
+    /** Line sparkline (default). */
+    LXW_SPARKLINE_LINE = 0,
+
+    /** Column sparkline. */
+    LXW_SPARKLINE_COLUMN,
+
+    /** Win/Loss sparkline. */
+    LXW_SPARKLINE_WIN_LOSS
+} lxw_sparkline_type;
+
+/**
+ * @brief Sparkline empty cell handling.
+ */
+typedef enum lxw_sparkline_empty_cells {
+    /** Show empty cells as gaps (default). */
+    LXW_SPARKLINE_EMPTY_CELLS_GAP = 0,
+
+    /** Show empty cells as zeros. */
+    LXW_SPARKLINE_EMPTY_CELLS_ZERO,
+
+    /** Connect points across empty cells. */
+    LXW_SPARKLINE_EMPTY_CELLS_SPAN
+} lxw_sparkline_empty_cells;
+
+/**
+ * @brief Sparkline axis type for min/max.
+ */
+typedef enum lxw_sparkline_axis_type {
+    /** Axis value is automatic (default). */
+    LXW_SPARKLINE_AXIS_AUTOMATIC = 0,
+
+    /** Axis value is same for all sparklines in group. */
+    LXW_SPARKLINE_AXIS_GROUP,
+
+    /** Axis value is set to a custom value. */
+    LXW_SPARKLINE_AXIS_CUSTOM
+} lxw_sparkline_axis_type;
+
+/**
+ * @brief Sparkline options.
+ *
+ * The members of this struct are used to define a sparkline that is inserted
+ * into a worksheet via worksheet_add_sparkline().
+ */
+typedef struct lxw_sparkline_options {
+
+    /** A string containing the range of data for the sparkline in a format
+     *  like "Sheet1!$A$1:$E$1". Required. */
+    const char *range;
+
+    /** A string containing the cell location of the sparkline. If this is
+     *  NULL, the location is specified by row/col parameters. */
+    const char *location;
+
+    /** The type of sparkline: line, column, or win/loss.
+     *  See #lxw_sparkline_type. Default is LXW_SPARKLINE_LINE. */
+    uint8_t type;
+
+    /** The style index (0-35) from the predefined Excel sparkline styles.
+     *  Default is 0. */
+    uint8_t style;
+
+    /** Show high point marker. */
+    uint8_t high_point;
+
+    /** Show low point marker. */
+    uint8_t low_point;
+
+    /** Show negative point markers. */
+    uint8_t negative_points;
+
+    /** Show first point marker. */
+    uint8_t first_point;
+
+    /** Show last point marker. */
+    uint8_t last_point;
+
+    /** Show markers on all points (line sparkline only). */
+    uint8_t markers;
+
+    /** Custom color for sparkline series (RGB). Use 0 for style default. */
+    lxw_color_t series_color;
+
+    /** Custom color for negative values (RGB). Use 0 for style default. */
+    lxw_color_t negative_color;
+
+    /** Custom color for markers (RGB). Use 0 for style default. */
+    lxw_color_t markers_color;
+
+    /** Custom color for first point (RGB). Use 0 for style default. */
+    lxw_color_t first_color;
+
+    /** Custom color for last point (RGB). Use 0 for style default. */
+    lxw_color_t last_color;
+
+    /** Custom color for high point (RGB). Use 0 for style default. */
+    lxw_color_t high_color;
+
+    /** Custom color for low point (RGB). Use 0 for style default. */
+    lxw_color_t low_color;
+
+    /** Minimum axis value for sparkline. */
+    double min;
+
+    /** Maximum axis value for sparkline. */
+    double max;
+
+    /** How min axis is calculated. See #lxw_sparkline_axis_type. */
+    uint8_t min_axis_type;
+
+    /** How max axis is calculated. See #lxw_sparkline_axis_type. */
+    uint8_t max_axis_type;
+
+    /** Show the horizontal axis. */
+    uint8_t show_axis;
+
+    /** Reverse the order of the data (right to left). */
+    uint8_t reverse;
+
+    /** Show data in hidden rows. */
+    uint8_t show_hidden;
+
+    /** How empty cells are handled. See #lxw_sparkline_empty_cells. */
+    uint8_t empty_cells;
+
+    /** Line weight in points (e.g., 0.75, 1.0, 2.25). Default is 0.75. */
+    double weight;
+
+    /** Range containing date axis data. */
+    const char *date_axis;
+
+} lxw_sparkline_options;
+
+/* Internal sparkline structure with resolved values */
+typedef struct lxw_sparkline {
+
+    STAILQ_ENTRY (lxw_sparkline) list_pointers;
+
+    char *range;
+    lxw_row_t row;
+    lxw_col_t col;
+    char *location;
+
+    uint8_t type;
+    uint8_t style;
+
+    uint8_t high_point;
+    uint8_t low_point;
+    uint8_t negative_points;
+    uint8_t first_point;
+    uint8_t last_point;
+    uint8_t markers;
+
+    lxw_color_t series_color;
+    lxw_color_t negative_color;
+    lxw_color_t markers_color;
+    lxw_color_t first_color;
+    lxw_color_t last_color;
+    lxw_color_t high_color;
+    lxw_color_t low_color;
+
+    double min;
+    double max;
+    uint8_t min_axis_type;
+    uint8_t max_axis_type;
+
+    uint8_t show_axis;
+    uint8_t reverse;
+    uint8_t show_hidden;
+    uint8_t empty_cells;
+
+    double weight;
+    char *date_axis;
+
+} lxw_sparkline;
+
+STAILQ_HEAD(lxw_sparklines, lxw_sparkline);
+
+#endif /* __LXW_SPARKLINE_H__ */
diff --git a/include/xlsxwriter/utility.h b/include/xlsxwriter/utility.h
index 075bdcff..6653f1af 100644
--- a/include/xlsxwriter/utility.h
+++ b/include/xlsxwriter/utility.h
@@ -212,30 +212,6 @@ double lxw_datetime_to_excel_datetime(lxw_datetime *datetime);
 double lxw_datetime_to_excel_date_with_epoch(lxw_datetime *datetime,
                                              uint8_t use_1904_epoch);
 
-/**
- * @brief Validate a #lxw_datetime struct.
- *
- * Validates a #lxw_datetime struct to ensure its fields are within acceptable
- * ranges for Excel dates and times.
- *
- * The members of the #lxw_datetime struct and the range of their values are:
- *
- * Member   | Value
- * -------- | -----------
- * year     | 1900 - 9999
- * month    | 1 - 12
- * day      | 1 - 31
- * hour     | 0 - 23
- * min      | 0 - 59
- * sec      | 0 - 59.999
- *
- * @param datetime A pointer to a #lxw_datetime struct.
- *
- * @return A #lxw_error code. Either #LXW_NO_ERROR or
- *         #LXW_ERROR_DATETIME_VALIDATION if a field is out of range.
- */
-lxw_error lxw_datetime_validate(lxw_datetime *datetime);
-
 /**
  * @brief Converts a unix datetime to an Excel datetime number.
  *
@@ -300,6 +276,47 @@ int lxw_sprintf_dbl(char *data, double number);
 
 uint16_t lxw_hash_password(const char *password);
 
+/**
+ * @brief Calculate the pixel width of a string based on character widths.
+ *
+ * @param string The string to calculate width for.
+ *
+ * @return The pixel width of the string using Calibri 11 font metrics.
+ *         Returns 0 if the string is NULL or empty.
+ *         Unhandled characters (including UTF-8) default to width 8.
+ *
+ * This function is useful for calculating column widths when implementing
+ * autofit-like functionality. Excel stores column widths, not autofit state,
+ * so applications must calculate widths themselves.
+ *
+ * Example:
+ * @code
+ *     uint16_t pixels = lxw_pixel_width("Hello World");
+ *     double width = lxw_autofit_width("Hello World");
+ *     worksheet_set_column(worksheet, 0, 0, width, NULL);
+ * @endcode
+ */
+uint16_t lxw_pixel_width(const char *string);
+
+/**
+ * @brief Calculate the column width required to autofit a string.
+ *
+ * @param string The string to calculate width for.
+ *
+ * @return The column width in Excel character units, suitable for use with
+ *         worksheet_set_column(). Returns 0 if the string is NULL or empty.
+ *
+ * This function calculates the pixel width of the string, adds 7 pixels of
+ * padding (as Excel does), and converts to column units.
+ *
+ * Example:
+ * @code
+ *     double width = lxw_autofit_width("Hello World");
+ *     worksheet_set_column(worksheet, 0, 0, width, NULL);
+ * @endcode
+ */
+double lxw_autofit_width(const char *string);
+
 /* *INDENT-OFF* */
 #ifdef __cplusplus
 }
diff --git a/include/xlsxwriter/workbook.h b/include/xlsxwriter/workbook.h
index f10f1f5e..75f01ba7 100644
--- a/include/xlsxwriter/workbook.h
+++ b/include/xlsxwriter/workbook.h
@@ -343,6 +343,7 @@ typedef struct lxw_workbook {
     uint8_t has_metadata;
     uint8_t has_embedded_images;
     uint8_t has_dynamic_functions;
+    uint8_t has_feature_property_bags;
     uint8_t has_embedded_image_descriptions;
 
     lxw_hash_table *used_xf_formats;
@@ -356,6 +357,8 @@ typedef struct lxw_workbook {
 
     lxw_format *default_url_format;
 
+    lxw_format *checkbox_format;
+
 } lxw_workbook;
 
 
diff --git a/include/xlsxwriter/worksheet.h b/include/xlsxwriter/worksheet.h
index 9a3bfb93..26f899d7 100644
--- a/include/xlsxwriter/worksheet.h
+++ b/include/xlsxwriter/worksheet.h
@@ -56,6 +56,7 @@
 #include "styles.h"
 #include "utility.h"
 #include "relationships.h"
+#include "sparkline.h"
 
 #define LXW_ROW_MAX                 1048576
 #define LXW_COL_MAX                 16384
@@ -821,6 +822,7 @@ STAILQ_HEAD(lxw_cond_format_list, lxw_cond_format_obj);
 STAILQ_HEAD(lxw_image_props, lxw_object_properties);
 STAILQ_HEAD(lxw_embedded_image_props, lxw_object_properties);
 STAILQ_HEAD(lxw_chart_props, lxw_object_properties);
+STAILQ_HEAD(lxw_textbox_props, lxw_object_properties);
 STAILQ_HEAD(lxw_comment_objs, lxw_vml_obj);
 STAILQ_HEAD(lxw_table_objs, lxw_table_obj);
 
@@ -1814,6 +1816,8 @@ typedef struct lxw_object_properties {
     char *image_position;
     uint8_t decorative;
     lxw_format *format;
+    char *text;
+    uint8_t is_textbox;
 
     STAILQ_ENTRY (lxw_object_properties) list_pointers;
 } lxw_object_properties;
@@ -2129,6 +2133,7 @@ typedef struct lxw_worksheet {
     struct lxw_image_props *image_props;
     struct lxw_image_props *embedded_image_props;
     struct lxw_chart_props *chart_data;
+    struct lxw_textbox_props *textbox_data;
     struct lxw_drawing_rel_ids *drawing_rel_ids;
     struct lxw_vml_drawing_rel_ids *vml_drawing_rel_ids;
     struct lxw_comment_objs *comment_objs;
@@ -2136,6 +2141,8 @@ typedef struct lxw_worksheet {
     struct lxw_comment_objs *button_objs;
     struct lxw_table_objs *table_objs;
     uint16_t table_count;
+    struct lxw_sparklines *sparklines;
+    uint8_t has_sparklines;
 
     lxw_row_t dim_rowmin;
     lxw_row_t dim_rowmax;
@@ -2254,6 +2261,7 @@ typedef struct lxw_worksheet {
 
     lxw_drawing *drawing;
     lxw_format *default_url_format;
+    lxw_format *checkbox_format;
 
     uint8_t has_vml;
     uint8_t has_comments;
@@ -2287,6 +2295,9 @@ typedef struct lxw_worksheet {
 
     uint8_t use_1904_epoch;
 
+    uint8_t has_checkboxes;
+    uint8_t has_textboxes;
+
     uint16_t excel_version;
 
     lxw_object_properties **header_footer_objs[LXW_HEADER_FOOTER_OBJS_MAX];
@@ -2319,6 +2330,7 @@ typedef struct lxw_worksheet_init_data {
     const char *quoted_name;
     const char *tmpdir;
     lxw_format *default_url_format;
+    lxw_format *checkbox_format;
     uint16_t max_url_length;
     uint8_t use_1904_epoch;
 
@@ -2943,6 +2955,36 @@ lxw_error worksheet_write_boolean(lxw_worksheet *worksheet,
                                   lxw_row_t row, lxw_col_t col,
                                   int value, lxw_format *format);
 
+/**
+ * @brief Write a checkbox to a worksheet cell.
+ *
+ * @param worksheet Pointer to a lxw_worksheet instance to be updated.
+ * @param row       The zero indexed row number.
+ * @param col       The zero indexed column number.
+ * @param value     The checkbox state: 0 = unchecked, non-zero = checked.
+ *
+ * @return A #lxw_error code.
+ *
+ * Insert a checkbox into a worksheet cell. The `value` parameter can be
+ * 0 for an unchecked checkbox or any non-zero value for a checked checkbox:
+ *
+ * @code
+ *     // Insert an unchecked checkbox in cell A1.
+ *     worksheet_insert_checkbox(worksheet, 0, 0, 0);
+ *
+ *     // Insert a checked checkbox in cell A2.
+ *     worksheet_insert_checkbox(worksheet, 1, 0, 1);
+ * @endcode
+ *
+ * @image html checkbox01.png
+ *
+ * Note: Checkbox is a feature introduced in Excel 365 and may not work
+ * in older versions of Excel.
+ *
+ */
+lxw_error worksheet_insert_checkbox(lxw_worksheet *worksheet,
+                                    lxw_row_t row, lxw_col_t col, int value);
+
 /**
  * @brief Write a formatted blank worksheet cell.
  *
@@ -4058,6 +4100,62 @@ lxw_error worksheet_insert_chart_opt(lxw_worksheet *worksheet,
                                      lxw_chart *chart,
                                      lxw_chart_options *user_options);
 
+/**
+ * @brief Insert a textbox object into a worksheet.
+ *
+ * @param worksheet Pointer to a lxw_worksheet instance to be updated.
+ * @param row       The zero indexed row number.
+ * @param col       The zero indexed column number.
+ * @param text      The text string to display in the textbox.
+ *
+ * @return A #lxw_error code.
+ *
+ * This function can be used to insert a textbox into a worksheet:
+ *
+ * @code
+ *     worksheet_insert_textbox(worksheet, 1, 1, "This is a textbox");
+ * @endcode
+ *
+ * The default textbox size is 192 x 120 pixels (approximately 3 columns x 6
+ * rows). The size and position of the textbox can be modified using the
+ * `worksheet_insert_textbox_opt()` function and the #lxw_textbox_options
+ * struct.
+ *
+ */
+lxw_error worksheet_insert_textbox(lxw_worksheet *worksheet,
+                                   lxw_row_t row, lxw_col_t col,
+                                   const char *text);
+
+/**
+ * @brief Insert a textbox object into a worksheet, with options.
+ *
+ * @param worksheet    Pointer to a lxw_worksheet instance to be updated.
+ * @param row          The zero indexed row number.
+ * @param col          The zero indexed column number.
+ * @param text         The text string to display in the textbox.
+ * @param user_options Optional textbox parameters.
+ *
+ * @return A #lxw_error code.
+ *
+ * The `%worksheet_insert_textbox_opt()` function is like
+ * `worksheet_insert_textbox()` function except that it takes an optional
+ * #lxw_textbox_options struct to set the size and position of the textbox:
+ *
+ * @code
+ *    lxw_textbox_options options = {.width = 256, .height = 100};
+ *
+ *    worksheet_insert_textbox_opt(worksheet, 1, 1, "A textbox", &options);
+ *
+ * @endcode
+ *
+ * The #lxw_textbox_options struct is defined in drawing.h.
+ *
+ */
+lxw_error worksheet_insert_textbox_opt(lxw_worksheet *worksheet,
+                                       lxw_row_t row, lxw_col_t col,
+                                       const char *text,
+                                       lxw_textbox_options * user_options);
+
 /**
  * @brief Merge a range of cells.
  *
@@ -4517,6 +4615,44 @@ lxw_error worksheet_add_table(lxw_worksheet *worksheet, lxw_row_t first_row,
                               lxw_col_t first_col, lxw_row_t last_row,
                               lxw_col_t last_col, lxw_table_options *options);
 
+/**
+ * @brief Add a sparkline to a worksheet cell.
+ *
+ * @param worksheet Pointer to a lxw_worksheet instance to be updated.
+ * @param row       The zero indexed row number.
+ * @param col       The zero indexed column number.
+ * @param options   A #lxw_sparkline_options struct to define the sparkline.
+ *
+ * @return A #lxw_error code.
+ *
+ * The `%worksheet_add_sparkline()` function is used to add a sparkline to a
+ * worksheet cell. Sparklines are small charts that fit in a single cell and
+ * allow you to show trends in data at a glance.
+ *
+ * @code
+ *     lxw_sparkline_options options = {
+ *         .range = "Sheet1!A1:E1",
+ *         .type = LXW_SPARKLINE_COLUMN,
+ *     };
+ *
+ *     worksheet_add_sparkline(worksheet, 0, 5, &options);
+ * @endcode
+ *
+ * The `range` parameter is required and specifies the data range that the
+ * sparkline will display. It should be a string like "Sheet1!A1:E1".
+ *
+ * The `type` parameter specifies the sparkline type: #LXW_SPARKLINE_LINE
+ * (default), #LXW_SPARKLINE_COLUMN, or #LXW_SPARKLINE_WIN_LOSS.
+ *
+ * The `style` parameter specifies one of 36 predefined styles (0-35).
+ *
+ * See @ref sparkline.h for all available options.
+ *
+ */
+lxw_error worksheet_add_sparkline(lxw_worksheet *worksheet,
+                                  lxw_row_t row, lxw_col_t col,
+                                  lxw_sparkline_options * options);
+
  /**
   * @brief Make a worksheet the active, i.e., visible worksheet.
   *
@@ -5926,6 +6062,10 @@ void lxw_worksheet_prepare_chart(lxw_worksheet *worksheet,
                                  lxw_object_properties *object_props,
                                  uint8_t is_chartsheet);
 
+void lxw_worksheet_prepare_textbox(lxw_worksheet *worksheet,
+                                   uint32_t drawing_id,
+                                   lxw_object_properties *object_props);
+
 uint32_t lxw_worksheet_prepare_vml_objects(lxw_worksheet *worksheet,
                                            uint32_t vml_data_id,
                                            uint32_t vml_shape_id,
diff --git a/src/chart.c b/src/chart.c
index 46680b87..982e0c4a 100644
--- a/src/chart.c
+++ b/src/chart.c
@@ -139,10 +139,12 @@ _chart_series_free(lxw_chart_series *series)
     free(series->line);
     free(series->fill);
     free(series->pattern);
+    free(series->gradient);
     free(series->label_num_format);
     free(series->label_line);
     free(series->label_fill);
     free(series->label_pattern);
+    free(series->label_gradient);
 
     _chart_free_font(series->label_font);
 
@@ -216,6 +218,10 @@ lxw_chart_free(lxw_chart *chart)
     _chart_free_axis(chart->x_axis);
     _chart_free_axis(chart->y_axis);
 
+    /* Secondary X2 and Y2 Axis. */
+    _chart_free_axis(chart->x2_axis);
+    _chart_free_axis(chart->y2_axis);
+
     /* Chart title. */
     _chart_free_font(chart->title.font);
     _chart_free_range(chart->title.range);
@@ -232,11 +238,13 @@ lxw_chart_free(lxw_chart *chart)
     free(chart->chartarea_line);
     free(chart->chartarea_fill);
     free(chart->chartarea_pattern);
+    free(chart->chartarea_gradient);
 
     free(chart->plotarea_line);
     free(chart->plotarea_fill);
     free(chart->plotarea_layout);
     free(chart->plotarea_pattern);
+    free(chart->plotarea_gradient);
 
     free(chart->drop_lines_line);
     free(chart->high_low_lines_line);
@@ -270,6 +278,12 @@ lxw_chart_new(uint8_t type)
     chart->y_axis = calloc(1, sizeof(struct lxw_chart_axis));
     GOTO_LABEL_ON_MEM_ERROR(chart->y_axis, mem_error);
 
+    chart->x2_axis = calloc(1, sizeof(struct lxw_chart_axis));
+    GOTO_LABEL_ON_MEM_ERROR(chart->x2_axis, mem_error);
+
+    chart->y2_axis = calloc(1, sizeof(struct lxw_chart_axis));
+    GOTO_LABEL_ON_MEM_ERROR(chart->y2_axis, mem_error);
+
     chart->title.range = calloc(1, sizeof(lxw_series_range));
     GOTO_LABEL_ON_MEM_ERROR(chart->title.range, mem_error);
 
@@ -279,6 +293,12 @@ lxw_chart_new(uint8_t type)
     chart->y_axis->title.range = calloc(1, sizeof(lxw_series_range));
     GOTO_LABEL_ON_MEM_ERROR(chart->y_axis->title.range, mem_error);
 
+    chart->x2_axis->title.range = calloc(1, sizeof(lxw_series_range));
+    GOTO_LABEL_ON_MEM_ERROR(chart->x2_axis->title.range, mem_error);
+
+    chart->y2_axis->title.range = calloc(1, sizeof(lxw_series_range));
+    GOTO_LABEL_ON_MEM_ERROR(chart->y2_axis->title.range, mem_error);
+
     /* Initialize the ranges in the chart titles. */
     if (_chart_init_data_cache(chart->title.range) != LXW_NO_ERROR)
         goto mem_error;
@@ -289,6 +309,12 @@ lxw_chart_new(uint8_t type)
     if (_chart_init_data_cache(chart->y_axis->title.range) != LXW_NO_ERROR)
         goto mem_error;
 
+    if (_chart_init_data_cache(chart->x2_axis->title.range) != LXW_NO_ERROR)
+        goto mem_error;
+
+    if (_chart_init_data_cache(chart->y2_axis->title.range) != LXW_NO_ERROR)
+        goto mem_error;
+
     chart->type = type;
     chart->style_id = 2;
     chart->hole_size = 50;
@@ -297,12 +323,22 @@ lxw_chart_new(uint8_t type)
     chart->x_axis->axis_position = LXW_CHART_AXIS_BOTTOM;
     chart->y_axis->axis_position = LXW_CHART_AXIS_LEFT;
 
+    /* Set the default secondary axis positions and properties. */
+    chart->x2_axis->axis_position = LXW_CHART_AXIS_BOTTOM;      /* Same as primary X axis */
+    chart->y2_axis->axis_position = LXW_CHART_AXIS_RIGHT;
+    chart->x2_axis->hidden = LXW_TRUE;  /* Secondary X axis hidden by default */
+    chart->y2_axis->crossing_max = LXW_TRUE;    /* Secondary Y axis crosses at max */
+
     /* Set the default axis number formats. */
     _chart_axis_set_default_num_format(chart->x_axis, "General");
     _chart_axis_set_default_num_format(chart->y_axis, "General");
+    _chart_axis_set_default_num_format(chart->x2_axis, "General");
+    _chart_axis_set_default_num_format(chart->y2_axis, "General");
 
     chart->x_axis->major_gridlines.visible = LXW_FALSE;
     chart->y_axis->major_gridlines.visible = LXW_TRUE;
+    chart->x2_axis->major_gridlines.visible = LXW_FALSE;
+    chart->y2_axis->major_gridlines.visible = LXW_FALSE;
 
     chart->has_horiz_cat_axis = LXW_FALSE;
     chart->has_horiz_val_axis = LXW_TRUE;
@@ -448,6 +484,64 @@ _chart_convert_pattern_args(lxw_chart_pattern *user_pattern)
     return pattern;
 }
 
+/*
+ * Create a copy of a user supplied gradient.
+ */
+STATIC lxw_chart_gradient_fill *
+_chart_convert_gradient_args(lxw_chart_gradient_fill *user_gradient)
+{
+    lxw_chart_gradient_fill *gradient;
+    uint8_t i;
+
+    if (!user_gradient)
+        return NULL;
+
+    if (user_gradient->num_stops < 2 ||
+        user_gradient->num_stops > LXW_CHART_GRADIENT_MAX_STOPS) {
+        LXW_WARN("chart_xxx_set_gradient: 'num_stops' must be 2-10");
+        return NULL;
+    }
+
+    gradient = calloc(1, sizeof(struct lxw_chart_gradient_fill));
+    RETURN_ON_MEM_ERROR(gradient, NULL);
+
+    /* Copy the user supplied properties. */
+    gradient->type = user_gradient->type;
+    gradient->num_stops = user_gradient->num_stops;
+    gradient->angle = user_gradient->angle;
+
+    /* Set default angle for linear gradients. */
+    if (gradient->type == LXW_CHART_GRADIENT_FILL_LINEAR
+        && gradient->angle == 0)
+        gradient->angle = 90;
+
+    for (i = 0; i < gradient->num_stops; i++) {
+        gradient->colors[i] = user_gradient->colors[i];
+        gradient->positions[i] = user_gradient->positions[i];
+    }
+
+    /* Set default positions if not specified. */
+    if (gradient->positions[0] == 0 && gradient->positions[1] == 0) {
+        if (gradient->num_stops == 2) {
+            gradient->positions[0] = 0;
+            gradient->positions[1] = 100;
+        }
+        else if (gradient->num_stops == 3) {
+            gradient->positions[0] = 0;
+            gradient->positions[1] = 50;
+            gradient->positions[2] = 100;
+        }
+        else if (gradient->num_stops == 4) {
+            gradient->positions[0] = 0;
+            gradient->positions[1] = 33;
+            gradient->positions[2] = 66;
+            gradient->positions[3] = 100;
+        }
+    }
+
+    return gradient;
+}
+
 /*
  * Create a copy of a user supplied layout.
  */
@@ -559,7 +653,7 @@ _chart_check_error_bars(lxw_series_error_bars *error_bars, char *property)
 }
 
 /*
- * Add unique ids for primary or secondary axes.
+ * Add unique ids for primary axes.
  */
 STATIC void
 _chart_add_axis_ids(lxw_chart *self)
@@ -571,6 +665,23 @@ _chart_add_axis_ids(lxw_chart *self)
     self->axis_id_2 = self->axis_id_1 + 1;
 }
 
+/*
+ * Add unique ids for secondary axes.
+ */
+STATIC void
+_chart_add_axis_ids_2(lxw_chart *self)
+{
+    uint32_t chart_id = 50010000 + self->id;
+    uint32_t axis_count = 1;
+
+    /* Secondary axes continue from primary axis count. */
+    if (self->axis_id_1)
+        axis_count = 3;
+
+    self->axis_id_3 = chart_id + axis_count;
+    self->axis_id_4 = self->axis_id_3 + 1;
+}
+
 /*
  * Utility function to set a chart range.
  */
@@ -2012,19 +2123,204 @@ _chart_write_a_patt_fill(lxw_chart *self, lxw_chart_pattern *pattern)
 }
 
 /*
- * Write the <c:spPr> element.
+ * Write the <a:gs> element for a gradient stop.
  */
 STATIC void
-_chart_write_sp_pr(lxw_chart *self, lxw_chart_line *line,
-                   lxw_chart_fill *fill, lxw_chart_pattern *pattern)
+_chart_write_a_gs(lxw_chart *self, uint8_t position, lxw_color_t color)
 {
-    if (!line && !fill && !pattern)
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("pos", position * 1000);
+
+    lxw_xml_start_tag(self->file, "a:gs", &attributes);
+
+    _chart_write_a_srgb_clr(self, color, LXW_FALSE);
+
+    lxw_xml_end_tag(self->file, "a:gs");
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <a:gsLst> element for gradient stops.
+ */
+STATIC void
+_chart_write_a_gs_lst(lxw_chart *self, lxw_chart_gradient_fill *gradient)
+{
+    uint8_t i;
+
+    lxw_xml_start_tag(self->file, "a:gsLst", NULL);
+
+    for (i = 0; i < gradient->num_stops; i++) {
+        _chart_write_a_gs(self, gradient->positions[i], gradient->colors[i]);
+    }
+
+    lxw_xml_end_tag(self->file, "a:gsLst");
+}
+
+/*
+ * Write the <a:lin> element for linear gradient angle.
+ */
+STATIC void
+_chart_write_a_lin(lxw_chart *self, uint16_t angle)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("ang", angle * 60000);
+    LXW_PUSH_ATTRIBUTES_STR("scaled", "0");
+
+    lxw_xml_empty_tag(self->file, "a:lin", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <a:fillToRect> element for path gradients.
+ */
+STATIC void
+_chart_write_a_fill_to_rect(lxw_chart *self, uint8_t gradient_type)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+
+    if (gradient_type == LXW_CHART_GRADIENT_FILL_PATH) {
+        LXW_PUSH_ATTRIBUTES_STR("l", "50000");
+        LXW_PUSH_ATTRIBUTES_STR("t", "50000");
+        LXW_PUSH_ATTRIBUTES_STR("r", "50000");
+        LXW_PUSH_ATTRIBUTES_STR("b", "50000");
+    }
+    else {
+        LXW_PUSH_ATTRIBUTES_STR("l", "100000");
+        LXW_PUSH_ATTRIBUTES_STR("t", "100000");
+    }
+
+    lxw_xml_empty_tag(self->file, "a:fillToRect", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <a:path> element for non-linear gradients.
+ */
+STATIC void
+_chart_write_a_gradient_path(lxw_chart *self, uint8_t gradient_type)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+    char *path_str = "shape";
+
+    LXW_INIT_ATTRIBUTES();
+
+    if (gradient_type == LXW_CHART_GRADIENT_FILL_RADIAL)
+        path_str = "circle";
+    else if (gradient_type == LXW_CHART_GRADIENT_FILL_RECTANGULAR)
+        path_str = "rect";
+    else if (gradient_type == LXW_CHART_GRADIENT_FILL_PATH)
+        path_str = "shape";
+
+    LXW_PUSH_ATTRIBUTES_STR("path", path_str);
+
+    lxw_xml_start_tag(self->file, "a:path", &attributes);
+
+    _chart_write_a_fill_to_rect(self, gradient_type);
+
+    lxw_xml_end_tag(self->file, "a:path");
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <a:tileRect> element for non-linear gradients.
+ */
+STATIC void
+_chart_write_a_tile_rect(lxw_chart *self, uint8_t gradient_type)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+
+    if (gradient_type != LXW_CHART_GRADIENT_FILL_PATH) {
+        LXW_PUSH_ATTRIBUTES_STR("r", "-100000");
+        LXW_PUSH_ATTRIBUTES_STR("b", "-100000");
+    }
+
+    lxw_xml_empty_tag(self->file, "a:tileRect", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <a:gradFill> element.
+ */
+STATIC void
+_chart_write_a_grad_fill(lxw_chart *self, lxw_chart_gradient_fill *gradient)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    if (!gradient)
+        return;
+
+    LXW_INIT_ATTRIBUTES();
+
+    if (gradient->type != LXW_CHART_GRADIENT_FILL_LINEAR) {
+        LXW_PUSH_ATTRIBUTES_STR("flip", "none");
+        LXW_PUSH_ATTRIBUTES_STR("rotWithShape", "1");
+    }
+
+    lxw_xml_start_tag(self->file, "a:gradFill", &attributes);
+
+    /* Write the a:gsLst element. */
+    _chart_write_a_gs_lst(self, gradient);
+
+    if (gradient->type == LXW_CHART_GRADIENT_FILL_LINEAR) {
+        /* Write the a:lin element. */
+        _chart_write_a_lin(self, gradient->angle);
+    }
+    else {
+        /* Write the a:path element. */
+        _chart_write_a_gradient_path(self, gradient->type);
+
+        /* Write the a:tileRect element. */
+        _chart_write_a_tile_rect(self, gradient->type);
+    }
+
+    lxw_xml_end_tag(self->file, "a:gradFill");
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <c:spPr> element with gradient support.
+ */
+STATIC void
+_chart_write_sp_pr_with_gradient(lxw_chart *self, lxw_chart_line *line,
+                                 lxw_chart_fill *fill,
+                                 lxw_chart_pattern *pattern,
+                                 lxw_chart_gradient_fill *gradient)
+{
+    if (!line && !fill && !pattern && !gradient)
         return;
 
     lxw_xml_start_tag(self->file, "c:spPr", NULL);
 
-    /* Write the series fill. Note: a pattern fill overrides a solid fill. */
-    if (fill && !pattern) {
+    /* Write the fill. Priority: gradient > pattern > solid fill. */
+    if (gradient) {
+        /* Write the a:gradFill element. */
+        _chart_write_a_grad_fill(self, gradient);
+    }
+    else if (pattern) {
+        /* Write the a:pattFill element. */
+        _chart_write_a_patt_fill(self, pattern);
+    }
+    else if (fill) {
         if (fill->none) {
             /* Write the a:noFill element. */
             _chart_write_a_no_fill(self);
@@ -2035,11 +2331,6 @@ _chart_write_sp_pr(lxw_chart *self, lxw_chart_line *line,
         }
     }
 
-    if (pattern) {
-        /* Write the a:pattFill element. */
-        _chart_write_a_patt_fill(self, pattern);
-    }
-
     if (line) {
         /* Write the a:ln element. */
         _chart_write_a_ln(self, line);
@@ -2048,6 +2339,16 @@ _chart_write_sp_pr(lxw_chart *self, lxw_chart_line *line,
     lxw_xml_end_tag(self->file, "c:spPr");
 }
 
+/*
+ * Write the <c:spPr> element.
+ */
+STATIC void
+_chart_write_sp_pr(lxw_chart *self, lxw_chart_line *line,
+                   lxw_chart_fill *fill, lxw_chart_pattern *pattern)
+{
+    _chart_write_sp_pr_with_gradient(self, line, fill, pattern, NULL);
+}
+
 /*
  * Write the <c:order> element.
  */
@@ -2083,7 +2384,7 @@ _chart_write_axis_id(lxw_chart *self, uint32_t axis_id)
 }
 
 /*
- * Write the <c:axId> element.
+ * Write the <c:axId> element for primary axes.
  */
 STATIC void
 _chart_write_axis_ids(lxw_chart *self)
@@ -2095,6 +2396,19 @@ _chart_write_axis_ids(lxw_chart *self)
     _chart_write_axis_id(self, self->axis_id_2);
 }
 
+/*
+ * Write the <c:axId> element for secondary axes.
+ */
+STATIC void
+_chart_write_axis_ids_2(lxw_chart *self)
+{
+    if (!self->axis_id_3)
+        _chart_add_axis_ids_2(self);
+
+    _chart_write_axis_id(self, self->axis_id_3);
+    _chart_write_axis_id(self, self->axis_id_4);
+}
+
 /*
  * Write the series name.
  */
@@ -2197,6 +2511,8 @@ _chart_write_symbol(lxw_chart *self, uint8_t type)
         LXW_PUSH_ATTRIBUTES_STR("val", "circle");
     else if (type == LXW_CHART_MARKER_PLUS)
         LXW_PUSH_ATTRIBUTES_STR("val", "plus");
+    else if (type == LXW_CHART_MARKER_DOT)
+        LXW_PUSH_ATTRIBUTES_STR("val", "dot");
     else
         LXW_PUSH_ATTRIBUTES_STR("val", "none");
 
@@ -3213,7 +3529,8 @@ _chart_write_ser(lxw_chart *self, lxw_chart_series *series)
     _chart_write_series_name(self, series);
 
     /* Write the c:spPr element. */
-    _chart_write_sp_pr(self, series->line, series->fill, series->pattern);
+    _chart_write_sp_pr_with_gradient(self, series->line, series->fill,
+                                     series->pattern, series->gradient);
 
     /* Write the c:marker element. */
     _chart_write_marker(self, series->marker);
@@ -3268,7 +3585,8 @@ _chart_write_xval_ser(lxw_chart *self, lxw_chart_series *series)
     _chart_write_series_name(self, series);
 
     /* Write the c:spPr element. */
-    _chart_write_sp_pr(self, series->line, series->fill, series->pattern);
+    _chart_write_sp_pr_with_gradient(self, series->line, series->fill,
+                                     series->pattern, series->gradient);
 
     /* Write the c:marker element. */
     _chart_write_marker(self, series->marker);
@@ -3451,6 +3769,23 @@ _chart_write_tick_label_pos(lxw_chart *self, lxw_chart_axis *axis)
     LXW_FREE_ATTRIBUTES();
 }
 
+/*
+ * Write the <c:tickLblPos> element with "none" value.
+ */
+STATIC void
+_chart_write_tick_label_pos_none(lxw_chart *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("val", "none");
+
+    lxw_xml_empty_tag(self->file, "c:tickLblPos", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
 /*
  * Write the <c:crossAx> element.
  */
@@ -3629,6 +3964,74 @@ _chart_write_minor_unit(lxw_chart *self, lxw_chart_axis *axis)
     LXW_FREE_ATTRIBUTES();
 }
 
+/*
+ * Write the <c:majorTimeUnit> element.
+ */
+STATIC void
+_chart_write_major_time_unit(lxw_chart *self, lxw_chart_axis *axis)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+    const char *val;
+
+    if (!axis->has_major_unit)
+        return;
+
+    LXW_INIT_ATTRIBUTES();
+
+    switch (axis->major_unit_type) {
+        case LXW_CHART_AXIS_TIME_UNIT_MONTHS:
+            val = "months";
+            break;
+        case LXW_CHART_AXIS_TIME_UNIT_YEARS:
+            val = "years";
+            break;
+        default:
+            val = "days";
+            break;
+    }
+
+    LXW_PUSH_ATTRIBUTES_STR("val", val);
+
+    lxw_xml_empty_tag(self->file, "c:majorTimeUnit", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <c:minorTimeUnit> element.
+ */
+STATIC void
+_chart_write_minor_time_unit(lxw_chart *self, lxw_chart_axis *axis)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+    const char *val;
+
+    if (!axis->has_minor_unit)
+        return;
+
+    LXW_INIT_ATTRIBUTES();
+
+    switch (axis->minor_unit_type) {
+        case LXW_CHART_AXIS_TIME_UNIT_MONTHS:
+            val = "months";
+            break;
+        case LXW_CHART_AXIS_TIME_UNIT_YEARS:
+            val = "years";
+            break;
+        default:
+            val = "days";
+            break;
+    }
+
+    LXW_PUSH_ATTRIBUTES_STR("val", val);
+
+    lxw_xml_empty_tag(self->file, "c:minorTimeUnit", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
 /*
  * Write the <c:dispUnits> element.
  */
@@ -4431,6 +4834,90 @@ _chart_write_cat_axis(lxw_chart *self)
     lxw_xml_end_tag(self->file, "c:catAx");
 }
 
+/*
+ * Write the <c:dateAx> element (for stock charts).
+ */
+STATIC void
+_chart_write_date_axis(lxw_chart *self)
+{
+    lxw_xml_start_tag(self->file, "c:dateAx", NULL);
+
+    _chart_write_axis_id(self, self->axis_id_1);
+
+    /* Write the c:scaling element. */
+    _chart_write_scaling(self,
+                         self->x_axis->reverse,
+                         self->x_axis->has_min, self->x_axis->min,
+                         self->x_axis->has_max, self->x_axis->max, 0);
+
+    /* Write the c:delete element to hide axis. */
+    if (self->x_axis->hidden)
+        _chart_write_delete(self);
+
+    /* Write the c:axPos element. */
+    _chart_write_axis_pos(self, self->x_axis->axis_position,
+                          self->y_axis->reverse);
+
+    /* Write the c:majorGridlines element. */
+    _chart_write_major_gridlines(self, self->x_axis);
+
+    /* Write the c:minorGridlines element. */
+    _chart_write_minor_gridlines(self, self->x_axis);
+
+    /* Write the axis title elements. */
+    self->x_axis->title.is_horizontal = self->has_horiz_cat_axis;
+    _chart_write_title(self, &self->x_axis->title);
+
+    /* Write the c:numFmt element. */
+    _chart_write_cat_number_format(self, self->x_axis);
+
+    /* Write the c:majorTickMark element. */
+    _chart_write_major_tick_mark(self, self->x_axis);
+
+    /* Write the c:minorTickMark element. */
+    _chart_write_minor_tick_mark(self, self->x_axis);
+
+    /* Write the c:tickLblPos element. */
+    _chart_write_tick_label_pos(self, self->x_axis);
+
+    /* Write the c:spPr element for the axis line. */
+    _chart_write_sp_pr(self, self->x_axis->line, self->x_axis->fill,
+                       self->x_axis->pattern);
+
+    /* Write the axis font elements. */
+    _chart_write_axis_font(self, self->x_axis->num_font);
+
+    /* Write the c:crossAx element. */
+    _chart_write_cross_axis(self, self->axis_id_2);
+
+    /* Write the c:crosses element. */
+    if (!self->y_axis->has_crossing || self->y_axis->crossing_min
+        || self->y_axis->crossing_max)
+        _chart_write_crosses(self, self->y_axis);
+    else
+        _chart_write_crosses_at(self, self->y_axis);
+
+    /* Write the c:auto element. */
+    _chart_write_auto(self);
+
+    /* Write the c:lblOffset element. */
+    _chart_write_label_offset(self);
+
+    /* Write the c:majorUnit element. */
+    _chart_write_major_unit(self, self->x_axis);
+
+    /* Write the c:majorTimeUnit element. */
+    _chart_write_major_time_unit(self, self->x_axis);
+
+    /* Write the c:minorUnit element. */
+    _chart_write_minor_unit(self, self->x_axis);
+
+    /* Write the c:minorTimeUnit element. */
+    _chart_write_minor_time_unit(self, self->x_axis);
+
+    lxw_xml_end_tag(self->file, "c:dateAx");
+}
+
 /*
  * Write the <c:valAx> element.
  */
@@ -4589,6 +5076,209 @@ _chart_write_cat_val_axis(lxw_chart *self)
     lxw_xml_end_tag(self->file, "c:valAx");
 }
 
+/*
+ * Write the <c:valAx> element for secondary Y axis.
+ */
+STATIC void
+_chart_write_val_axis_2(lxw_chart *self)
+{
+    /* If there are no secondary axis IDs, don't write this element. */
+    if (!self->axis_id_3)
+        return;
+
+    lxw_xml_start_tag(self->file, "c:valAx", NULL);
+
+    _chart_write_axis_id(self, self->axis_id_4);
+
+    /* Write the c:scaling element. */
+    _chart_write_scaling(self,
+                         self->y2_axis->reverse,
+                         self->y2_axis->has_min, self->y2_axis->min,
+                         self->y2_axis->has_max, self->y2_axis->max,
+                         self->y2_axis->log_base);
+
+    /* Write the c:delete element to hide axis. */
+    if (self->y2_axis->hidden)
+        _chart_write_delete(self);
+
+    /* Write the c:axPos element. */
+    _chart_write_axis_pos(self, self->y2_axis->axis_position,
+                          self->x2_axis->reverse);
+
+    /* Write the c:majorGridlines element. */
+    _chart_write_major_gridlines(self, self->y2_axis);
+
+    /* Write the c:minorGridlines element. */
+    _chart_write_minor_gridlines(self, self->y2_axis);
+
+    /* Write the axis title elements. */
+    self->y2_axis->title.is_horizontal = self->has_horiz_val_axis;
+    _chart_write_title(self, &self->y2_axis->title);
+
+    /* Write the c:numFmt element. */
+    _chart_write_number_format(self, self->y2_axis);
+
+    /* Write the c:majorTickMark element. */
+    _chart_write_major_tick_mark(self, self->y2_axis);
+
+    /* Write the c:minorTickMark element. */
+    _chart_write_minor_tick_mark(self, self->y2_axis);
+
+    /* Write the c:tickLblPos element. */
+    _chart_write_tick_label_pos(self, self->y2_axis);
+
+    /* Write the c:spPr element for the axis line. */
+    _chart_write_sp_pr(self, self->y2_axis->line, self->y2_axis->fill,
+                       self->y2_axis->pattern);
+
+    /* Write the axis font elements. */
+    _chart_write_axis_font(self, self->y2_axis->num_font);
+
+    /* Write the c:crossAx element. */
+    _chart_write_cross_axis(self, self->axis_id_3);
+
+    /* Write the c:crosses element. */
+    _chart_write_crosses(self, self->y2_axis);
+
+    /* Write the c:crossBetween element. */
+    _chart_write_cross_between(self, self->y2_axis->position_axis);
+
+    /* Write the c:majorUnit element. */
+    _chart_write_major_unit(self, self->y2_axis);
+
+    /* Write the c:minorUnit element. */
+    _chart_write_minor_unit(self, self->y2_axis);
+
+    /* Write the c:dispUnits element. */
+    _chart_write_disp_units(self, self->y2_axis);
+
+    lxw_xml_end_tag(self->file, "c:valAx");
+}
+
+/*
+ * Write the <c:catAx> element for secondary X axis.
+ */
+STATIC void
+_chart_write_cat_axis_2(lxw_chart *self)
+{
+    /* If there are no secondary axis IDs, don't write this element. */
+    if (!self->axis_id_3)
+        return;
+
+    lxw_xml_start_tag(self->file, "c:catAx", NULL);
+
+    _chart_write_axis_id(self, self->axis_id_3);
+
+    /* Write the c:scaling element. */
+    _chart_write_scaling(self,
+                         self->x2_axis->reverse,
+                         LXW_FALSE, 0.0, LXW_FALSE, 0.0, 0);
+
+    /* Write the c:delete element to hide axis (secondary X axis hidden by default). */
+    if (self->x2_axis->hidden)
+        _chart_write_delete(self);
+
+    /* Write the c:axPos element. */
+    _chart_write_axis_pos(self, self->x2_axis->axis_position,
+                          self->y2_axis->reverse);
+
+    /* Write the c:majorGridlines element. */
+    _chart_write_major_gridlines(self, self->x2_axis);
+
+    /* Write the c:minorGridlines element. */
+    _chart_write_minor_gridlines(self, self->x2_axis);
+
+    /* Write the axis title elements. */
+    self->x2_axis->title.is_horizontal = self->has_horiz_cat_axis;
+    _chart_write_title(self, &self->x2_axis->title);
+
+    /* Write the c:numFmt element. */
+    _chart_write_cat_number_format(self, self->x2_axis);
+
+    /* Write the c:majorTickMark element. */
+    _chart_write_major_tick_mark(self, self->x2_axis);
+
+    /* Write the c:minorTickMark element. */
+    _chart_write_minor_tick_mark(self, self->x2_axis);
+
+    /* Write the c:tickLblPos element. */
+    _chart_write_tick_label_pos(self, self->x2_axis);
+
+    /* Write the c:spPr element for the axis line. */
+    _chart_write_sp_pr(self, self->x2_axis->line, self->x2_axis->fill,
+                       self->x2_axis->pattern);
+
+    /* Write the axis font elements. */
+    _chart_write_axis_font(self, self->x2_axis->num_font);
+
+    /* Write the c:crossAx element. */
+    _chart_write_cross_axis(self, self->axis_id_4);
+
+    /* Write the c:crosses element - secondary axis crosses at max. */
+    _chart_write_crosses(self, self->y2_axis);
+
+    /* Write the c:auto element. */
+    _chart_write_auto(self);
+
+    /* Write the c:lblAlgn element. */
+    _chart_write_label_align(self, self->x2_axis);
+
+    /* Write the c:lblOffset element. */
+    _chart_write_label_offset(self);
+
+    /* Write the c:tickLblSkip element. */
+    _chart_write_tick_label_skip(self, self->x2_axis);
+
+    /* Write the c:tickMarkSkip element. */
+    _chart_write_tick_mark_skip(self, self->x2_axis);
+
+    lxw_xml_end_tag(self->file, "c:catAx");
+}
+
+/*
+ * Write the <c:dateAx> element for secondary X axis (used by stock charts).
+ */
+STATIC void
+_chart_write_date_axis_2(lxw_chart *self)
+{
+    /* If there are no secondary axis IDs, don't write this element. */
+    if (!self->axis_id_3)
+        return;
+
+    lxw_xml_start_tag(self->file, "c:dateAx", NULL);
+
+    _chart_write_axis_id(self, self->axis_id_3);
+
+    /* Write the c:scaling element. */
+    _chart_write_scaling(self,
+                         self->x2_axis->reverse,
+                         LXW_FALSE, 0.0, LXW_FALSE, 0.0, 0);
+
+    /* Write the c:delete element (secondary X axis hidden by default). */
+    _chart_write_delete(self);
+
+    /* Write the c:axPos element. */
+    _chart_write_axis_pos(self, self->x2_axis->axis_position,
+                          self->y2_axis->reverse);
+
+    /* Write the c:numFmt element. */
+    _chart_write_cat_number_format(self, self->x2_axis);
+
+    /* Write the c:tickLblPos element (none for hidden secondary axis). */
+    _chart_write_tick_label_pos_none(self);
+
+    /* Write the c:crossAx element. */
+    _chart_write_cross_axis(self, self->axis_id_4);
+
+    /* Write the c:auto element. */
+    _chart_write_auto(self);
+
+    /* Write the c:lblOffset element. */
+    _chart_write_label_offset(self);
+
+    lxw_xml_end_tag(self->file, "c:dateAx");
+}
+
 /*
  * Write the <c:barDir> element.
  */
@@ -4610,9 +5300,25 @@ _chart_write_bar_dir(lxw_chart *self, char *type)
  * Write a area chart.
  */
 STATIC void
-_chart_write_area_chart(lxw_chart *self)
+_chart_write_area_chart(lxw_chart *self, uint8_t primary_axes)
 {
     lxw_chart_series *series;
+    uint8_t has_series = LXW_FALSE;
+
+    /* Check if there are any series for this axis type. */
+    STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        if (primary_axes && !series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+        if (!primary_axes && series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+    }
+
+    if (!has_series)
+        return;
 
     lxw_xml_start_tag(self->file, "c:areaChart", NULL);
 
@@ -4620,6 +5326,11 @@ _chart_write_area_chart(lxw_chart *self)
     _chart_write_grouping(self, self->grouping);
 
     STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        /* Only write series for the current axis type. */
+        if (primary_axes && series->y2_axis)
+            continue;
+        if (!primary_axes && !series->y2_axis)
+            continue;
         /* Write the c:ser element. */
         _chart_write_ser(self, series);
     }
@@ -4628,7 +5339,10 @@ _chart_write_area_chart(lxw_chart *self)
     _chart_write_drop_lines(self);
 
     /* Write the c:axId elements. */
-    _chart_write_axis_ids(self);
+    if (primary_axes)
+        _chart_write_axis_ids(self);
+    else
+        _chart_write_axis_ids_2(self);
 
     lxw_xml_end_tag(self->file, "c:areaChart");
 }
@@ -4637,9 +5351,25 @@ _chart_write_area_chart(lxw_chart *self)
  * Write a bar chart.
  */
 STATIC void
-_chart_write_bar_chart(lxw_chart *self)
+_chart_write_bar_chart(lxw_chart *self, uint8_t primary_axes)
 {
     lxw_chart_series *series;
+    uint8_t has_series = LXW_FALSE;
+
+    /* Check if there are any series for this axis type. */
+    STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        if (primary_axes && !series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+        if (!primary_axes && series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+    }
+
+    if (!has_series)
+        return;
 
     lxw_xml_start_tag(self->file, "c:barChart", NULL);
 
@@ -4650,18 +5380,32 @@ _chart_write_bar_chart(lxw_chart *self)
     _chart_write_grouping(self, self->grouping);
 
     STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        /* Only write series for the current axis type. */
+        if (primary_axes && series->y2_axis)
+            continue;
+        if (!primary_axes && !series->y2_axis)
+            continue;
         /* Write the c:ser element. */
         _chart_write_ser(self, series);
     }
 
     /* Write the c:gapWidth element. */
-    _chart_write_gap_width(self, self->gap_y1);
+    if (primary_axes)
+        _chart_write_gap_width(self, self->gap_y1);
+    else
+        _chart_write_gap_width(self, self->gap_y2);
 
     /* Write the c:overlap element. */
-    _chart_write_overlap(self, self->overlap_y1);
+    if (primary_axes)
+        _chart_write_overlap(self, self->overlap_y1);
+    else
+        _chart_write_overlap(self, self->overlap_y2);
 
     /* Write the c:axId elements. */
-    _chart_write_axis_ids(self);
+    if (primary_axes)
+        _chart_write_axis_ids(self);
+    else
+        _chart_write_axis_ids_2(self);
 
     lxw_xml_end_tag(self->file, "c:barChart");
 }
@@ -4670,9 +5414,25 @@ _chart_write_bar_chart(lxw_chart *self)
  * Write a column chart.
  */
 STATIC void
-_chart_write_column_chart(lxw_chart *self)
+_chart_write_column_chart(lxw_chart *self, uint8_t primary_axes)
 {
     lxw_chart_series *series;
+    uint8_t has_series = LXW_FALSE;
+
+    /* Check if there are any series for this axis type. */
+    STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        if (primary_axes && !series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+        if (!primary_axes && series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+    }
+
+    if (!has_series)
+        return;
 
     lxw_xml_start_tag(self->file, "c:barChart", NULL);
 
@@ -4683,18 +5443,32 @@ _chart_write_column_chart(lxw_chart *self)
     _chart_write_grouping(self, self->grouping);
 
     STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        /* Only write series for the current axis type. */
+        if (primary_axes && series->y2_axis)
+            continue;
+        if (!primary_axes && !series->y2_axis)
+            continue;
         /* Write the c:ser element. */
         _chart_write_ser(self, series);
     }
 
     /* Write the c:gapWidth element. */
-    _chart_write_gap_width(self, self->gap_y1);
+    if (primary_axes)
+        _chart_write_gap_width(self, self->gap_y1);
+    else
+        _chart_write_gap_width(self, self->gap_y2);
 
     /* Write the c:overlap element. */
-    _chart_write_overlap(self, self->overlap_y1);
+    if (primary_axes)
+        _chart_write_overlap(self, self->overlap_y1);
+    else
+        _chart_write_overlap(self, self->overlap_y2);
 
     /* Write the c:axId elements. */
-    _chart_write_axis_ids(self);
+    if (primary_axes)
+        _chart_write_axis_ids(self);
+    else
+        _chart_write_axis_ids_2(self);
 
     lxw_xml_end_tag(self->file, "c:barChart");
 }
@@ -4703,10 +5477,14 @@ _chart_write_column_chart(lxw_chart *self)
  * Write a doughnut chart.
  */
 STATIC void
-_chart_write_doughnut_chart(lxw_chart *self)
+_chart_write_doughnut_chart(lxw_chart *self, uint8_t primary_axes)
 {
     lxw_chart_series *series;
 
+    /* Doughnut charts don't support secondary axes. */
+    if (!primary_axes)
+        return;
+
     lxw_xml_start_tag(self->file, "c:doughnutChart", NULL);
 
     /* Write the c:varyColors element. */
@@ -4730,9 +5508,25 @@ _chart_write_doughnut_chart(lxw_chart *self)
  * Write a line chart.
  */
 STATIC void
-_chart_write_line_chart(lxw_chart *self)
+_chart_write_line_chart(lxw_chart *self, uint8_t primary_axes)
 {
     lxw_chart_series *series;
+    uint8_t has_series = LXW_FALSE;
+
+    /* Check if there are any series for this axis type. */
+    STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        if (primary_axes && !series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+        if (!primary_axes && series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+    }
+
+    if (!has_series)
+        return;
 
     lxw_xml_start_tag(self->file, "c:lineChart", NULL);
 
@@ -4740,6 +5534,11 @@ _chart_write_line_chart(lxw_chart *self)
     _chart_write_grouping(self, self->grouping);
 
     STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        /* Only write series for the current axis type. */
+        if (primary_axes && series->y2_axis)
+            continue;
+        if (!primary_axes && !series->y2_axis)
+            continue;
         /* Write the c:ser element. */
         _chart_write_ser(self, series);
     }
@@ -4757,19 +5556,118 @@ _chart_write_line_chart(lxw_chart *self)
     _chart_write_marker_value(self);
 
     /* Write the c:axId elements. */
-    _chart_write_axis_ids(self);
+    if (primary_axes)
+        _chart_write_axis_ids(self);
+    else
+        _chart_write_axis_ids_2(self);
 
     lxw_xml_end_tag(self->file, "c:lineChart");
 }
 
+/*
+ * Write a stock chart.
+ */
+STATIC void
+_chart_write_stock_chart(lxw_chart *self, uint8_t primary_axes)
+{
+    lxw_chart_series *series;
+    uint8_t has_series = LXW_FALSE;
+    uint16_t index = 0;
+
+    /* Default line for stock chart series (width 2.25, noFill). */
+    lxw_chart_line default_line = {.width = 2.25,.none = LXW_TRUE };
+
+    /* Default markers for stock chart series. */
+    lxw_chart_marker default_marker_none = {.type = LXW_CHART_MARKER_NONE };
+    lxw_chart_marker default_marker_dot = {.type = LXW_CHART_MARKER_DOT,
+        .size = 3
+    };
+
+    /* Check if there are any series for this axis type. */
+    STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        if (primary_axes && !series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+        if (!primary_axes && series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+    }
+
+    if (!has_series)
+        return;
+
+    lxw_xml_start_tag(self->file, "c:stockChart", NULL);
+
+    STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        lxw_chart_line *orig_line = series->line;
+        lxw_chart_marker *orig_marker = series->marker;
+
+        /* Only write series for the current axis type. */
+        if (primary_axes && series->y2_axis) {
+            index++;
+            continue;
+        }
+        if (!primary_axes && !series->y2_axis) {
+            index++;
+            continue;
+        }
+
+        /* Apply default line formatting if not user-defined. */
+        if (!series->line)
+            series->line = &default_line;
+
+        /* Apply default marker formatting if not user-defined. */
+        if (!series->marker) {
+            /* Series 2 (index % 4 == 2) gets dot marker, others get none. */
+            if (index % 4 == 2)
+                series->marker = &default_marker_dot;
+            else
+                series->marker = &default_marker_none;
+        }
+
+        /* Write the c:ser element. */
+        _chart_write_ser(self, series);
+
+        /* Restore original values. */
+        series->line = orig_line;
+        series->marker = orig_marker;
+
+        index++;
+    }
+
+    /* Write the c:dropLines element. */
+    _chart_write_drop_lines(self);
+
+    /* Write the c:hiLowLines element (primary axes only). */
+    if (primary_axes)
+        _chart_write_hi_low_lines(self);
+
+    /* Write the c:upDownBars element. */
+    _chart_write_up_down_bars(self);
+
+    /* Write the c:axId elements. */
+    if (primary_axes)
+        _chart_write_axis_ids(self);
+    else
+        _chart_write_axis_ids_2(self);
+
+    lxw_xml_end_tag(self->file, "c:stockChart");
+}
+
 /*
  * Write a pie chart.
  */
 STATIC void
-_chart_write_pie_chart(lxw_chart *self)
+_chart_write_pie_chart(lxw_chart *self, uint8_t primary_axes)
 {
     lxw_chart_series *series;
 
+    /* Pie charts don't support secondary axes. */
+    if (!primary_axes)
+        return;
+
     lxw_xml_start_tag(self->file, "c:pieChart", NULL);
 
     /* Write the c:varyColors element. */
@@ -4790,9 +5688,25 @@ _chart_write_pie_chart(lxw_chart *self)
  * Write a scatter chart.
  */
 STATIC void
-_chart_write_scatter_chart(lxw_chart *self)
+_chart_write_scatter_chart(lxw_chart *self, uint8_t primary_axes)
 {
     lxw_chart_series *series;
+    uint8_t has_series = LXW_FALSE;
+
+    /* Check if there are any series for this axis type. */
+    STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        if (primary_axes && !series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+        if (!primary_axes && series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+    }
+
+    if (!has_series)
+        return;
 
     lxw_xml_start_tag(self->file, "c:scatterChart", NULL);
 
@@ -4800,6 +5714,11 @@ _chart_write_scatter_chart(lxw_chart *self)
     _chart_write_scatter_style(self);
 
     STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        /* Only write series for the current axis type. */
+        if (primary_axes && series->y2_axis)
+            continue;
+        if (!primary_axes && !series->y2_axis)
+            continue;
 
         /* Add default scatter chart formatting to the series data unless
          * it has already been specified by the user.*/
@@ -4819,7 +5738,10 @@ _chart_write_scatter_chart(lxw_chart *self)
     }
 
     /* Write the c:axId elements. */
-    _chart_write_axis_ids(self);
+    if (primary_axes)
+        _chart_write_axis_ids(self);
+    else
+        _chart_write_axis_ids_2(self);
 
     lxw_xml_end_tag(self->file, "c:scatterChart");
 }
@@ -4828,9 +5750,25 @@ _chart_write_scatter_chart(lxw_chart *self)
  * Write a radar chart.
  */
 STATIC void
-_chart_write_radar_chart(lxw_chart *self)
+_chart_write_radar_chart(lxw_chart *self, uint8_t primary_axes)
 {
     lxw_chart_series *series;
+    uint8_t has_series = LXW_FALSE;
+
+    /* Check if there are any series for this axis type. */
+    STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        if (primary_axes && !series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+        if (!primary_axes && series->y2_axis) {
+            has_series = LXW_TRUE;
+            break;
+        }
+    }
+
+    if (!has_series)
+        return;
 
     lxw_xml_start_tag(self->file, "c:radarChart", NULL);
 
@@ -4838,12 +5776,20 @@ _chart_write_radar_chart(lxw_chart *self)
     _chart_write_radar_style(self);
 
     STAILQ_FOREACH(series, self->series_list, list_pointers) {
+        /* Only write series for the current axis type. */
+        if (primary_axes && series->y2_axis)
+            continue;
+        if (!primary_axes && !series->y2_axis)
+            continue;
         /* Write the c:ser element. */
         _chart_write_ser(self, series);
     }
 
     /* Write the c:axId elements. */
-    _chart_write_axis_ids(self);
+    if (primary_axes)
+        _chart_write_axis_ids(self);
+    else
+        _chart_write_axis_ids_2(self);
 
     lxw_xml_end_tag(self->file, "c:radarChart");
 }
@@ -4873,7 +5819,32 @@ _chart_write_scatter_plot_area(lxw_chart *self)
     _chart_write_layout(self, self->plotarea_layout);
 
     /* Write subclass chart type elements for primary and secondary axes. */
-    self->write_chart_type(self);
+    self->write_chart_type(self, LXW_TRUE);
+    self->write_chart_type(self, LXW_FALSE);
+
+    /* Configure a combined chart if present. */
+    if (self->combined) {
+        self->combined->id = (self->combined->is_secondary) ?
+            1000 + self->id : self->id;
+        self->combined->file = self->file;
+        self->combined->series_index = self->series_index;
+
+        /* Combined charts use the primary chart's axis IDs. */
+        if (!self->combined->is_secondary) {
+            /* Non-secondary combined chart uses primary chart's axis IDs. */
+            self->combined->axis_id_1 = self->axis_id_1;
+            self->combined->axis_id_2 = self->axis_id_2;
+        }
+        else {
+            /* Secondary combined chart uses primary chart's secondary axis IDs. */
+            self->combined->axis_id_1 = self->axis_id_3;
+            self->combined->axis_id_2 = self->axis_id_4;
+        }
+
+        /* Write the subclass chart type elements for the combined chart. */
+        self->combined->write_chart_type(self->combined, LXW_TRUE);
+        self->combined->write_chart_type(self->combined, LXW_FALSE);
+    }
 
     /* Reverse the opposite axis position if crossing position is "max". */
     _chart_adjust_max_crossing(self);
@@ -4886,9 +5857,34 @@ _chart_write_scatter_plot_area(lxw_chart *self)
     /* Write the c:valAx element. */
     _chart_write_val_axis(self);
 
+    /* Write the secondary axis elements. */
+    _chart_write_val_axis_2(self);
+
+    /* Write the secondary axis for the combined chart.
+     * Use the primary chart's y2_axis settings for axis title, formatting, etc. */
+    if (self->combined && self->combined->is_secondary) {
+        lxw_chart_axis *combined_y2_axis = self->combined->y2_axis;
+        self->combined->y2_axis = self->y2_axis;
+        _chart_write_val_axis_2(self->combined);
+        self->combined->y2_axis = combined_y2_axis;
+    }
+
+    _chart_write_cat_axis_2(self);
+
+    /* Write the secondary category axis for the combined chart.
+     * Use the primary chart's x2_axis settings for axis formatting, etc. */
+    if (self->combined && self->combined->is_secondary) {
+        lxw_chart_axis *combined_x2_axis = self->combined->x2_axis;
+        self->combined->x2_axis = self->x2_axis;
+        _chart_write_cat_axis_2(self->combined);
+        self->combined->x2_axis = combined_x2_axis;
+    }
+
     /* Write the c:spPr element for the plotarea formatting. */
-    _chart_write_sp_pr(self, self->plotarea_line, self->plotarea_fill,
-                       self->plotarea_pattern);
+    _chart_write_sp_pr_with_gradient(self, self->plotarea_line,
+                                     self->plotarea_fill,
+                                     self->plotarea_pattern,
+                                     self->plotarea_gradient);
 
     lxw_xml_end_tag(self->file, "c:plotArea");
 }
@@ -4904,12 +5900,96 @@ _chart_write_pie_plot_area(lxw_chart *self)
     /* Write the c:layout element. */
     _chart_write_layout(self, self->plotarea_layout);
 
-    /* Write subclass chart type elements for primary and secondary axes. */
-    self->write_chart_type(self);
+    /* Write subclass chart type elements (pie/doughnut don't have secondary axes). */
+    self->write_chart_type(self, LXW_TRUE);
+
+    /* Configure a combined chart if present (pie/doughnut + pie/doughnut). */
+    if (self->combined) {
+        self->combined->file = self->file;
+        self->combined->series_index = self->series_index;
+
+        /* Write the subclass chart type elements for the combined chart. */
+        self->combined->write_chart_type(self->combined, LXW_TRUE);
+    }
 
     /* Write the c:spPr element for the plotarea formatting. */
-    _chart_write_sp_pr(self, self->plotarea_line, self->plotarea_fill,
-                       self->plotarea_pattern);
+    _chart_write_sp_pr_with_gradient(self, self->plotarea_line,
+                                     self->plotarea_fill,
+                                     self->plotarea_pattern,
+                                     self->plotarea_gradient);
+
+    lxw_xml_end_tag(self->file, "c:plotArea");
+}
+
+/*
+ * Write the <c:plotArea> element for stock charts (uses date axis).
+ */
+STATIC void
+_chart_write_stock_plot_area(lxw_chart *self)
+{
+    lxw_xml_start_tag(self->file, "c:plotArea", NULL);
+
+    /* Write the c:layout element. */
+    _chart_write_layout(self, self->plotarea_layout);
+
+    /* Write subclass chart type elements for primary and secondary axes. */
+    self->write_chart_type(self, LXW_TRUE);
+    self->write_chart_type(self, LXW_FALSE);
+
+    /* Configure a combined chart if present. */
+    if (self->combined) {
+        self->combined->id = (self->combined->is_secondary) ?
+            1000 + self->id : self->id;
+        self->combined->file = self->file;
+        self->combined->series_index = self->series_index;
+
+        /* Combined charts use the primary chart's axis IDs. */
+        if (!self->combined->is_secondary) {
+            self->combined->axis_id_1 = self->axis_id_1;
+            self->combined->axis_id_2 = self->axis_id_2;
+        }
+        else {
+            self->combined->axis_id_1 = self->axis_id_3;
+            self->combined->axis_id_2 = self->axis_id_4;
+        }
+
+        /* Write the subclass chart type elements for the combined chart. */
+        self->combined->write_chart_type(self->combined, LXW_TRUE);
+        self->combined->write_chart_type(self->combined, LXW_FALSE);
+    }
+
+    /* Reverse the opposite axis position if crossing position is "max". */
+    _chart_adjust_max_crossing(self);
+
+    /* Write the c:dateAx element (stock charts use date axis). */
+    _chart_write_date_axis(self);
+
+    /* Write the c:valAx element. */
+    _chart_write_val_axis(self);
+
+    /* Write the secondary axis elements. */
+    _chart_write_val_axis_2(self);
+
+    /* Write the secondary axis for the combined chart.
+     * Use the primary chart's y2_axis settings for axis title, formatting, etc. */
+    if (self->combined && self->combined->is_secondary) {
+        lxw_chart_axis *combined_y2_axis = self->combined->y2_axis;
+        self->combined->y2_axis = self->y2_axis;
+        _chart_write_val_axis_2(self->combined);
+        self->combined->y2_axis = combined_y2_axis;
+    }
+
+    /* Write the secondary date axis for stock charts. */
+    _chart_write_date_axis_2(self);
+
+    /* Write the c:dTable element. */
+    _chart_write_d_table(self);
+
+    /* Write the c:spPr element for the plotarea formatting. */
+    _chart_write_sp_pr_with_gradient(self, self->plotarea_line,
+                                     self->plotarea_fill,
+                                     self->plotarea_pattern,
+                                     self->plotarea_gradient);
 
     lxw_xml_end_tag(self->file, "c:plotArea");
 }
@@ -4926,23 +6006,76 @@ _chart_write_plot_area(lxw_chart *self)
     _chart_write_layout(self, self->plotarea_layout);
 
     /* Write subclass chart type elements for primary and secondary axes. */
-    self->write_chart_type(self);
+    self->write_chart_type(self, LXW_TRUE);
+    self->write_chart_type(self, LXW_FALSE);
+
+    /* Configure a combined chart if present. */
+    if (self->combined) {
+        self->combined->id = (self->combined->is_secondary) ?
+            1000 + self->id : self->id;
+        self->combined->file = self->file;
+        self->combined->series_index = self->series_index;
+
+        /* Combined charts use the primary chart's axis IDs. */
+        if (!self->combined->is_secondary) {
+            /* Non-secondary combined chart uses primary chart's axis IDs. */
+            self->combined->axis_id_1 = self->axis_id_1;
+            self->combined->axis_id_2 = self->axis_id_2;
+        }
+        else {
+            /* Secondary combined chart uses primary chart's secondary axis IDs. */
+            self->combined->axis_id_1 = self->axis_id_3;
+            self->combined->axis_id_2 = self->axis_id_4;
+        }
+
+        /* Write the subclass chart type elements for the combined chart. */
+        self->combined->write_chart_type(self->combined, LXW_TRUE);
+        self->combined->write_chart_type(self->combined, LXW_FALSE);
+    }
 
     /* Reverse the opposite axis position if crossing position is "max". */
     _chart_adjust_max_crossing(self);
 
-    /* Write the c:catAx element. */
-    _chart_write_cat_axis(self);
+    /* Write the c:catAx or c:dateAx element. */
+    if (self->x_axis->is_date)
+        _chart_write_date_axis(self);
+    else
+        _chart_write_cat_axis(self);
 
     /* Write the c:valAx element. */
     _chart_write_val_axis(self);
 
+    /* Write the secondary axis elements. */
+    _chart_write_val_axis_2(self);
+
+    /* Write the secondary axis for the combined chart.
+     * Use the primary chart's y2_axis settings for axis title, formatting, etc. */
+    if (self->combined && self->combined->is_secondary) {
+        lxw_chart_axis *combined_y2_axis = self->combined->y2_axis;
+        self->combined->y2_axis = self->y2_axis;
+        _chart_write_val_axis_2(self->combined);
+        self->combined->y2_axis = combined_y2_axis;
+    }
+
+    _chart_write_cat_axis_2(self);
+
+    /* Write the secondary category axis for the combined chart.
+     * Use the primary chart's x2_axis settings for axis formatting, etc. */
+    if (self->combined && self->combined->is_secondary) {
+        lxw_chart_axis *combined_x2_axis = self->combined->x2_axis;
+        self->combined->x2_axis = self->x2_axis;
+        _chart_write_cat_axis_2(self->combined);
+        self->combined->x2_axis = combined_x2_axis;
+    }
+
     /* Write the c:dTable element. */
     _chart_write_d_table(self);
 
     /* Write the c:spPr element for the plotarea formatting. */
-    _chart_write_sp_pr(self, self->plotarea_line, self->plotarea_fill,
-                       self->plotarea_pattern);
+    _chart_write_sp_pr_with_gradient(self, self->plotarea_line,
+                                     self->plotarea_fill,
+                                     self->plotarea_pattern,
+                                     self->plotarea_gradient);
 
     lxw_xml_end_tag(self->file, "c:plotArea");
 }
@@ -5183,6 +6316,30 @@ _chart_initialize_radar_chart(lxw_chart *self, uint8_t type)
     self->write_plot_area = _chart_write_plot_area;
 }
 
+/*
+ * Initialize a stock chart.
+ */
+STATIC void
+_chart_initialize_stock_chart(lxw_chart *self)
+{
+    self->chart_group = LXW_CHART_STOCK;
+    self->x_axis->is_category = LXW_TRUE;
+    self->y_axis->is_value = LXW_TRUE;
+    self->date_category = LXW_TRUE;
+    self->default_label_position = LXW_CHART_LABEL_POSITION_RIGHT;
+
+    /* Stock charts have hi-low lines enabled by default. */
+    self->has_high_low_lines = LXW_TRUE;
+
+    /* Set default date format for the X axis. */
+    _chart_axis_set_default_num_format(self->x_axis, "dd/mm/yyyy");
+    _chart_axis_set_default_num_format(self->x2_axis, "dd/mm/yyyy");
+
+    /* Initialize the function pointers for this chart type. */
+    self->write_chart_type = _chart_write_stock_chart;
+    self->write_plot_area = _chart_write_stock_plot_area;
+}
+
 /*
  * Initialize the chart specific properties.
  */
@@ -5237,6 +6394,10 @@ _chart_initialize(lxw_chart *self, uint8_t type)
             _chart_initialize_radar_chart(self, type);
             break;
 
+        case LXW_CHART_STOCK:
+            _chart_initialize_stock_chart(self);
+            break;
+
         default:
             LXW_WARN_FORMAT1("workbook_add_chart(): "
                              "unhandled chart type '%d'", type);
@@ -5274,8 +6435,10 @@ lxw_chart_assemble_xml_file(lxw_chart *self)
     _chart_write_chart(self);
 
     /* Write the c:spPr element for the chartarea formatting. */
-    _chart_write_sp_pr(self, self->chartarea_line, self->chartarea_fill,
-                       self->chartarea_pattern);
+    _chart_write_sp_pr_with_gradient(self, self->chartarea_line,
+                                     self->chartarea_fill,
+                                     self->chartarea_pattern,
+                                     self->chartarea_gradient);
 
     /* Write the c:printSettings element. */
     if (!self->is_chartsheet)
@@ -5318,14 +6481,14 @@ lxw_chart_add_data_cache(lxw_series_range *range, uint8_t *data,
  * Add a series to the chart.
  */
 lxw_chart_series *
-chart_add_series(lxw_chart *self, const char *categories, const char *values)
+chart_add_series_impl(lxw_chart *self, const char *categories,
+                      const char *values, uint8_t y2_axis)
 {
     lxw_chart_series *series;
 
     /* Scatter charts require categories and values. */
     if (self->chart_group == LXW_CHART_SCATTER && values && !categories) {
-        LXW_WARN("chart_add_series(): scatter charts must have "
-                 "'categories' and 'values'");
+        LXW_WARN("chart_add_series(): scatter charts must have " "'categories' and 'values'");  /* Keep user-facing name */
 
         return NULL;
     }
@@ -5384,6 +6547,13 @@ chart_add_series(lxw_chart *self, const char *categories, const char *values)
 
     series->default_label_position = self->default_label_position;
 
+    /* Set the secondary axis flag. */
+    series->y2_axis = y2_axis;
+    if (y2_axis) {
+        self->has_secondary_axis = LXW_TRUE;
+        self->is_secondary = LXW_TRUE;
+    }
+
     STAILQ_INSERT_TAIL(self->series_list, series, list_pointers);
 
     return series;
@@ -5527,18 +6697,28 @@ chart_series_set_pattern(lxw_chart_series *series, lxw_chart_pattern *pattern)
     series->pattern = _chart_convert_pattern_args(pattern);
 }
 
+/*
+ * Set a gradient fill type for a series.
+ */
+void
+chart_series_set_gradient(lxw_chart_series *series,
+                          lxw_chart_gradient_fill *gradient)
+{
+    if (!gradient)
+        return;
+
+    /* Free any previously allocated resource. */
+    free(series->gradient);
+
+    series->gradient = _chart_convert_gradient_args(gradient);
+}
+
 /*
  * Set a marker type for a series.
  */
 void
 chart_series_set_marker_type(lxw_chart_series *series, uint8_t type)
 {
-    if (type > LXW_CHART_MARKER_PLUS) {
-        LXW_WARN_FORMAT1
-            ("chart_series_set_marker_type(): invalid marker type: %d", type);
-        return;
-    }
-
     if (!series->marker) {
         lxw_chart_marker *marker = calloc(1, sizeof(struct lxw_chart_marker));
         RETURN_VOID_ON_MEM_ERROR(marker);
@@ -5554,13 +6734,6 @@ chart_series_set_marker_type(lxw_chart_series *series, uint8_t type)
 void
 chart_series_set_marker_size(lxw_chart_series *series, uint8_t size)
 {
-    if (size < 2 || size > 72) {
-        LXW_WARN_FORMAT1
-            ("chart_series_set_marker_size(): marker size '%d' outside Excel range: 2 <= size <= 72",
-             size);
-        return;
-    }
-
     if (!series->marker) {
         lxw_chart_marker *marker = calloc(1, sizeof(struct lxw_chart_marker));
         RETURN_VOID_ON_MEM_ERROR(marker);
@@ -5787,13 +6960,6 @@ mem_error:
 void
 chart_series_set_labels_separator(lxw_chart_series *series, uint8_t separator)
 {
-    if (separator > LXW_CHART_LABEL_SEPARATOR_SPACE) {
-        LXW_WARN_FORMAT1
-            ("chart_series_set_labels_separator(): invalid label separator: %d",
-             separator);
-        return;
-    }
-
     series->has_labels = LXW_TRUE;
     series->label_separator = separator;
 }
@@ -5804,13 +6970,6 @@ chart_series_set_labels_separator(lxw_chart_series *series, uint8_t separator)
 void
 chart_series_set_labels_position(lxw_chart_series *series, uint8_t position)
 {
-    if (position > LXW_CHART_LABEL_POSITION_BEST_FIT) {
-        LXW_WARN_FORMAT1
-            ("chart_series_set_labels_position(): invalid label position: %d",
-             position);
-        return;
-    }
-
     series->has_labels = LXW_TRUE;
     series->show_labels_value = LXW_TRUE;
 
@@ -5932,13 +7091,6 @@ void
 chart_series_set_trendline(lxw_chart_series *series, uint8_t type,
                            uint8_t value)
 {
-    if (type > LXW_CHART_TRENDLINE_TYPE_AVERAGE) {
-        LXW_WARN_FORMAT1
-            ("chart_series_set_trendline(): invalid trendline type: %d",
-             type);
-        return;
-    }
-
     if (type == LXW_CHART_TRENDLINE_TYPE_POLY
         || type == LXW_CHART_TRENDLINE_TYPE_AVERAGE) {
 
@@ -6162,6 +7314,18 @@ chart_series_set_error_bars_line(lxw_series_error_bars *error_bars,
     error_bars->line = _chart_convert_line_args(line);
 }
 
+/*
+ * Combine two charts into a single combined chart.
+ */
+void
+chart_combine(lxw_chart *self, lxw_chart *combined_chart)
+{
+    if (!self || !combined_chart)
+        return;
+
+    self->combined = combined_chart;
+}
+
 /*
  * Get an axis pointer from a chart.
  */
@@ -6175,6 +7339,10 @@ chart_axis_get(lxw_chart *self, lxw_chart_axis_type axis_type)
         return self->x_axis;
     else if (axis_type == LXW_CHART_AXIS_TYPE_Y)
         return self->y_axis;
+    else if (axis_type == LXW_CHART_AXIS_TYPE_X2)
+        return self->x2_axis;
+    else if (axis_type == LXW_CHART_AXIS_TYPE_Y2)
+        return self->y2_axis;
     else
         return NULL;
 }
@@ -6370,12 +7538,6 @@ chart_axis_off(lxw_chart_axis *axis)
 void
 chart_axis_set_position(lxw_chart_axis *axis, uint8_t position)
 {
-    if (position > LXW_CHART_AXIS_POSITION_BETWEEN) {
-        LXW_WARN_FORMAT1
-            ("chart_axis_set_position(): invalid position: %d", position);
-        return;
-    }
-
     LXW_WARN_CAT_AND_DATE_AXIS_ONLY("chart_axis_set_position");
 
     axis->position_axis = position;
@@ -6387,13 +7549,6 @@ chart_axis_set_position(lxw_chart_axis *axis, uint8_t position)
 void
 chart_axis_set_label_position(lxw_chart_axis *axis, uint8_t position)
 {
-    if (position > LXW_CHART_AXIS_LABEL_POSITION_NONE) {
-        LXW_WARN_FORMAT1
-            ("chart_axis_set_label_position(): invalid label position: %d",
-             position);
-        return;
-    }
-
     axis->label_position = position;
 }
 
@@ -6440,13 +7595,6 @@ chart_axis_set_log_base(lxw_chart_axis *axis, uint16_t log_base)
 void
 chart_axis_set_major_tick_mark(lxw_chart_axis *axis, uint8_t type)
 {
-    if (type > LXW_CHART_AXIS_TICK_MARK_CROSSING) {
-        LXW_WARN_FORMAT1
-            ("chart_axis_set_major_tick_mark(): invalid tick mark type: %d",
-             type);
-        return;
-    }
-
     axis->major_tick_mark = type;
 }
 
@@ -6456,13 +7604,6 @@ chart_axis_set_major_tick_mark(lxw_chart_axis *axis, uint8_t type)
 void
 chart_axis_set_minor_tick_mark(lxw_chart_axis *axis, uint8_t type)
 {
-    if (type > LXW_CHART_AXIS_TICK_MARK_CROSSING) {
-        LXW_WARN_FORMAT1
-            ("chart_axis_set_minor_tick_mark(): invalid tick mark type: %d",
-             type);
-        return;
-    }
-
     axis->minor_tick_mark = type;
 }
 
@@ -6512,19 +7653,41 @@ chart_axis_set_minor_unit(lxw_chart_axis *axis, double unit)
     axis->minor_unit = unit;
 }
 
+/*
+ * Set the category axis as a date axis.
+ */
+void
+chart_axis_set_date_axis(lxw_chart_axis *axis)
+{
+    LXW_WARN_CAT_AXIS_ONLY("chart_axis_set_date_axis");
+
+    axis->is_date = LXW_TRUE;
+}
+
+/*
+ * Set the time unit type for the major unit of a date axis.
+ */
+void
+chart_axis_set_major_unit_type(lxw_chart_axis *axis, uint8_t type)
+{
+    axis->major_unit_type = type;
+}
+
+/*
+ * Set the time unit type for the minor unit of a date axis.
+ */
+void
+chart_axis_set_minor_unit_type(lxw_chart_axis *axis, uint8_t type)
+{
+    axis->minor_unit_type = type;
+}
+
 /*
  * Set the display units for a value axis.
  */
 void
 chart_axis_set_display_units(lxw_chart_axis *axis, uint8_t units)
 {
-    if (units > LXW_CHART_AXIS_UNITS_TRILLIONS) {
-        LXW_WARN_FORMAT1
-            ("chart_axis_set_display_units(): invalid display units: %d",
-             units);
-        return;
-    }
-
     LXW_WARN_VALUE_AXIS_ONLY("chart_axis_set_display_units");
 
     axis->display_units = units;
@@ -6606,13 +7769,6 @@ chart_axis_minor_gridlines_set_line(lxw_chart_axis *axis,
 void
 chart_axis_set_label_align(lxw_chart_axis *axis, uint8_t align)
 {
-    if (align > LXW_CHART_AXIS_LABEL_ALIGN_RIGHT) {
-        LXW_WARN_FORMAT1
-            ("chart_axis_set_label_align(): invalid label alignment: %d",
-             align);
-        return;
-    }
-
     axis->label_align = align;
 }
 
@@ -6699,13 +7855,6 @@ chart_title_set_overlay(lxw_chart *self, uint8_t overlay)
 void
 chart_legend_set_position(lxw_chart *self, uint8_t position)
 {
-    if (position > LXW_CHART_LEGEND_OVERLAY_TOP_RIGHT) {
-        LXW_WARN_FORMAT1
-            ("chart_legend_set_position(): invalid legend position: %d",
-             position);
-        return;
-    }
-
     self->legend.position = position;
 }
 
@@ -6811,6 +7960,22 @@ chart_chartarea_set_pattern(lxw_chart *self, lxw_chart_pattern *pattern)
     self->chartarea_pattern = _chart_convert_pattern_args(pattern);
 }
 
+/*
+ * Set a gradient fill type for the chartarea.
+ */
+void
+chart_chartarea_set_gradient(lxw_chart *self,
+                             lxw_chart_gradient_fill *gradient)
+{
+    if (!gradient)
+        return;
+
+    /* Free any previously allocated resource. */
+    free(self->chartarea_gradient);
+
+    self->chartarea_gradient = _chart_convert_gradient_args(gradient);
+}
+
 /*
  * Set a line type for the plotarea.
  */
@@ -6856,6 +8021,22 @@ chart_plotarea_set_pattern(lxw_chart *self, lxw_chart_pattern *pattern)
     self->plotarea_pattern = _chart_convert_pattern_args(pattern);
 }
 
+/*
+ * Set a gradient fill type for the plotarea.
+ */
+void
+chart_plotarea_set_gradient(lxw_chart *self,
+                            lxw_chart_gradient_fill *gradient)
+{
+    if (!gradient)
+        return;
+
+    /* Free any previously allocated resource. */
+    free(self->plotarea_gradient);
+
+    self->plotarea_gradient = _chart_convert_gradient_args(gradient);
+}
+
 /*
  * Set a layout for the plotarea.
  */
@@ -6992,13 +8173,6 @@ chart_set_series_overlap(lxw_chart *self, int8_t overlap)
 void
 chart_show_blanks_as(lxw_chart *self, uint8_t option)
 {
-    if (option > LXW_CHART_BLANKS_AS_CONNECTED) {
-        LXW_WARN_FORMAT1
-            ("chart_show_blanks_as(): invalid blank display option: %d",
-             option);
-        return;
-    }
-
     self->show_blanks_as = option;
 }
 
@@ -7024,6 +8198,33 @@ chart_set_series_gap(lxw_chart *self, uint16_t gap)
                          "outside Excel range: 0 <= gap <= 500", gap);
 }
 
+/*
+ * Set the Bar/Column overlap for secondary axis data series.
+ */
+void
+chart_set_series_overlap_y2(lxw_chart *self, int8_t overlap)
+{
+    if (overlap >= -100 && overlap <= 100)
+        self->overlap_y2 = overlap;
+    else
+        LXW_WARN_FORMAT1
+            ("chart_set_series_overlap_y2(): Chart series overlap "
+             "'%d' outside Excel range: -100 <= overlap <= 100", overlap);
+}
+
+/*
+ * Set the Bar/Column gap for secondary axis data series.
+ */
+void
+chart_set_series_gap_y2(lxw_chart *self, uint16_t gap)
+{
+    if (gap <= 500)
+        self->gap_y2 = gap;
+    else
+        LXW_WARN_FORMAT1("chart_set_series_gap_y2(): Chart series gap '%d' "
+                         "outside Excel range: 0 <= gap <= 500", gap);
+}
+
 /*
  * Set the Pie/Doughnut chart rotation: the angle of the first slice.
  */
diff --git a/src/content_types.c b/src/content_types.c
index 830be522..0b6c888d 100644
--- a/src/content_types.c
+++ b/src/content_types.c
@@ -411,3 +411,14 @@ lxw_ct_add_rich_value(lxw_content_types *self)
                         LXW_APP_MSEXCEL "richvaluerel+xml");
 
 }
+
+/*
+ * Add the featurePropertyBag file to the ContentTypes overrides.
+ */
+void
+lxw_ct_add_feature_property_bag(lxw_content_types *self)
+{
+    lxw_ct_add_override(self,
+                        "/xl/featurePropertyBag/featurePropertyBag.xml",
+                        LXW_APP_MSEXCEL "featurepropertybag+xml");
+}
diff --git a/src/drawing.c b/src/drawing.c
index 8371873f..061e6190 100644
--- a/src/drawing.c
+++ b/src/drawing.c
@@ -57,6 +57,7 @@ lxw_free_drawing_object(lxw_drawing_object *drawing_object)
 
     free(drawing_object->description);
     free(drawing_object->tip);
+    free(drawing_object->text);
 
     free(drawing_object);
 }
@@ -603,6 +604,325 @@ _drawing_write_pic(lxw_drawing *self, uint32_t index,
     lxw_xml_end_tag(self->file, "xdr:pic");
 }
 
+/*
+ * Write the <xdr:cNvSpPr> element for textbox shapes.
+ */
+STATIC void
+_drawing_write_c_nv_sp_pr_textbox(lxw_drawing *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("txBox", 1);
+
+    lxw_xml_empty_tag(self->file, "xdr:cNvSpPr", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <xdr:nvSpPr> element for shapes.
+ */
+STATIC void
+_drawing_write_nv_sp_pr(lxw_drawing *self, uint32_t index,
+                        lxw_drawing_object *drawing_object)
+{
+    lxw_xml_start_tag(self->file, "xdr:nvSpPr", NULL);
+
+    /* Write the xdr:cNvPr element. */
+    _drawing_write_c_nv_pr(self, "TextBox", index, drawing_object);
+
+    /* Write the xdr:cNvSpPr element. */
+    _drawing_write_c_nv_sp_pr_textbox(self);
+
+    lxw_xml_end_tag(self->file, "xdr:nvSpPr");
+}
+
+/*
+ * Write the <a:prstGeom> element for shapes.
+ */
+STATIC void
+_drawing_write_a_prst_geom_rect(lxw_drawing *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("prst", "rect");
+
+    lxw_xml_start_tag(self->file, "a:prstGeom", &attributes);
+
+    lxw_xml_empty_tag(self->file, "a:avLst", NULL);
+
+    lxw_xml_end_tag(self->file, "a:prstGeom");
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <xdr:spPr> element for shapes.
+ */
+STATIC void
+_drawing_write_sp_pr_shape(lxw_drawing *self,
+                           lxw_drawing_object *drawing_object)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    lxw_xml_start_tag(self->file, "xdr:spPr", NULL);
+
+    /* Write the a:xfrm element. */
+    _drawing_write_a_xfrm(self, drawing_object);
+
+    /* Write the a:prstGeom element. */
+    _drawing_write_a_prst_geom_rect(self);
+
+    /* Write the a:solidFill element with scheme color. */
+    lxw_xml_start_tag(self->file, "a:solidFill", NULL);
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("val", "lt1");
+    lxw_xml_empty_tag(self->file, "a:schemeClr", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    lxw_xml_end_tag(self->file, "a:solidFill");
+
+    /* Write the a:ln element with line styling. */
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("w", 9525);
+    LXW_PUSH_ATTRIBUTES_STR("cmpd", "sng");
+    lxw_xml_start_tag(self->file, "a:ln", &attributes);
+    LXW_FREE_ATTRIBUTES();
+
+    /* Write line solid fill with shaded scheme color. */
+    lxw_xml_start_tag(self->file, "a:solidFill", NULL);
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("val", "lt1");
+    lxw_xml_start_tag(self->file, "a:schemeClr", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("val", 50000);
+    lxw_xml_empty_tag(self->file, "a:shade", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    lxw_xml_end_tag(self->file, "a:schemeClr");
+    lxw_xml_end_tag(self->file, "a:solidFill");
+
+    lxw_xml_end_tag(self->file, "a:ln");
+
+    lxw_xml_end_tag(self->file, "xdr:spPr");
+}
+
+/*
+ * Write the <a:t> element for text.
+ */
+STATIC void
+_drawing_write_a_t(lxw_drawing *self, const char *text)
+{
+    lxw_xml_data_element(self->file, "a:t", text, NULL);
+}
+
+/*
+ * Write the <a:rPr> element for text run properties.
+ */
+STATIC void
+_drawing_write_a_r_pr(lxw_drawing *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("lang", "en-US");
+    LXW_PUSH_ATTRIBUTES_INT("sz", 1100);
+
+    lxw_xml_empty_tag(self->file, "a:rPr", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <a:r> element for text run.
+ */
+STATIC void
+_drawing_write_a_r(lxw_drawing *self, const char *text)
+{
+    lxw_xml_start_tag(self->file, "a:r", NULL);
+
+    /* Write the a:rPr element. */
+    _drawing_write_a_r_pr(self);
+
+    /* Write the a:t element. */
+    _drawing_write_a_t(self, text);
+
+    lxw_xml_end_tag(self->file, "a:r");
+}
+
+/*
+ * Write the <a:pPr> element for paragraph properties.
+ */
+STATIC void
+_drawing_write_a_p_pr(lxw_drawing *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("algn", "l");
+
+    lxw_xml_empty_tag(self->file, "a:pPr", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <a:p> element for paragraph.
+ */
+STATIC void
+_drawing_write_a_p_textbox(lxw_drawing *self, const char *text)
+{
+    lxw_xml_start_tag(self->file, "a:p", NULL);
+
+    /* Write the a:r element. */
+    _drawing_write_a_r(self, text);
+
+    lxw_xml_end_tag(self->file, "a:p");
+}
+
+/*
+ * Write the <a:bodyPr> element for text body properties.
+ */
+STATIC void
+_drawing_write_a_body_pr(lxw_drawing *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("wrap", "square");
+    LXW_PUSH_ATTRIBUTES_INT("rtlCol", 0);
+    LXW_PUSH_ATTRIBUTES_STR("anchor", "t");
+
+    lxw_xml_empty_tag(self->file, "a:bodyPr", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <xdr:txBody> element for textbox.
+ */
+STATIC void
+_drawing_write_tx_body(lxw_drawing *self, const char *text)
+{
+    lxw_xml_start_tag(self->file, "xdr:txBody", NULL);
+
+    /* Write the a:bodyPr element. */
+    _drawing_write_a_body_pr(self);
+
+    /* Write the a:lstStyle element. */
+    lxw_xml_empty_tag(self->file, "a:lstStyle", NULL);
+
+    /* Write the a:p element. */
+    _drawing_write_a_p_textbox(self, text);
+
+    lxw_xml_end_tag(self->file, "xdr:txBody");
+}
+
+/*
+ * Write the <xdr:style> element for shapes.
+ */
+STATIC void
+_drawing_write_style(lxw_drawing *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    lxw_xml_start_tag(self->file, "xdr:style", NULL);
+
+    /* Write the a:lnRef element. */
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("idx", 0);
+    lxw_xml_start_tag(self->file, "a:lnRef", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("r", 0);
+    LXW_PUSH_ATTRIBUTES_INT("g", 0);
+    LXW_PUSH_ATTRIBUTES_INT("b", 0);
+    lxw_xml_empty_tag(self->file, "a:scrgbClr", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    lxw_xml_end_tag(self->file, "a:lnRef");
+
+    /* Write the a:fillRef element. */
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("idx", 0);
+    lxw_xml_start_tag(self->file, "a:fillRef", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("r", 0);
+    LXW_PUSH_ATTRIBUTES_INT("g", 0);
+    LXW_PUSH_ATTRIBUTES_INT("b", 0);
+    lxw_xml_empty_tag(self->file, "a:scrgbClr", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    lxw_xml_end_tag(self->file, "a:fillRef");
+
+    /* Write the a:effectRef element. */
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("idx", 0);
+    lxw_xml_start_tag(self->file, "a:effectRef", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_INT("r", 0);
+    LXW_PUSH_ATTRIBUTES_INT("g", 0);
+    LXW_PUSH_ATTRIBUTES_INT("b", 0);
+    lxw_xml_empty_tag(self->file, "a:scrgbClr", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    lxw_xml_end_tag(self->file, "a:effectRef");
+
+    /* Write the a:fontRef element. */
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("idx", "minor");
+    lxw_xml_start_tag(self->file, "a:fontRef", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("val", "dk1");
+    lxw_xml_empty_tag(self->file, "a:schemeClr", &attributes);
+    LXW_FREE_ATTRIBUTES();
+    lxw_xml_end_tag(self->file, "a:fontRef");
+
+    lxw_xml_end_tag(self->file, "xdr:style");
+}
+
+/*
+ * Write the <xdr:sp> element for shapes.
+ */
+STATIC void
+_drawing_write_sp(lxw_drawing *self, uint32_t index,
+                  lxw_drawing_object *drawing_object)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("macro", "");
+    LXW_PUSH_ATTRIBUTES_STR("textlink", "");
+
+    lxw_xml_start_tag(self->file, "xdr:sp", &attributes);
+
+    /* Write the xdr:nvSpPr element. */
+    _drawing_write_nv_sp_pr(self, index, drawing_object);
+
+    /* Write the xdr:spPr element. */
+    _drawing_write_sp_pr_shape(self, drawing_object);
+
+    /* Write the xdr:style element. */
+    _drawing_write_style(self);
+
+    /* Write the xdr:txBody element if there is text. */
+    if (drawing_object->text)
+        _drawing_write_tx_body(self, drawing_object->text);
+
+    lxw_xml_end_tag(self->file, "xdr:sp");
+
+    LXW_FREE_ATTRIBUTES();
+}
+
 /*
  * Write the <xdr:clientData> element.
  */
@@ -842,10 +1162,9 @@ _drawing_write_two_cell_anchor(lxw_drawing *self, uint32_t index,
         /* Write the xdr:pic element. */
         _drawing_write_pic(self, index, drawing_object);
     }
-    else {
-        /* Write the xdr:sp element for shapes. */
-        /* _drawing_write_sp(self, index, col_absolute, row_absolute, width,
-           height,  shape); */
+    else if (drawing_object->type == LXW_DRAWING_SHAPE) {
+        /* Write the xdr:sp element for shapes/textboxes. */
+        _drawing_write_sp(self, index, drawing_object);
     }
 
     /* Write the xdr:clientData element. */
diff --git a/src/feature_property_bag.c b/src/feature_property_bag.c
new file mode 100644
index 00000000..5a70e5ec
--- /dev/null
+++ b/src/feature_property_bag.c
@@ -0,0 +1,259 @@
+/*
+ * libxlsxwriter
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ * feature_property_bag - A libxlsxwriter library for creating Excel XLSX
+ *                        featurePropertyBag files.
+ *
+ */
+
+#include "xlsxwriter/xmlwriter.h"
+#include "xlsxwriter/feature_property_bag.h"
+#include "xlsxwriter/utility.h"
+
+/*
+ * Forward declarations.
+ */
+
+/*****************************************************************************
+ *
+ * Private functions.
+ *
+ ****************************************************************************/
+
+/*
+ * Create a new feature_property_bag object.
+ */
+lxw_feature_property_bag *
+lxw_feature_property_bag_new(void)
+{
+    lxw_feature_property_bag *feature_property_bag =
+        calloc(1, sizeof(lxw_feature_property_bag));
+    GOTO_LABEL_ON_MEM_ERROR(feature_property_bag, mem_error);
+
+    return feature_property_bag;
+
+mem_error:
+    lxw_feature_property_bag_free(feature_property_bag);
+    return NULL;
+}
+
+/*
+ * Free a feature_property_bag object.
+ */
+void
+lxw_feature_property_bag_free(lxw_feature_property_bag *feature_property_bag)
+{
+    if (!feature_property_bag)
+        return;
+
+    free(feature_property_bag);
+}
+
+/*****************************************************************************
+ *
+ * XML functions.
+ *
+ ****************************************************************************/
+
+/*
+ * Write the XML declaration.
+ */
+STATIC void
+_feature_property_bag_xml_declaration(lxw_feature_property_bag *self)
+{
+    lxw_xml_declaration(self->file);
+}
+
+/*
+ * Write the <FeaturePropertyBags> element.
+ */
+STATIC void
+_write_feature_property_bags(lxw_feature_property_bag *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("xmlns",
+                            "http://schemas.microsoft.com/office/spreadsheetml/2022/featurepropertybag");
+
+    lxw_xml_start_tag(self->file, "FeaturePropertyBags", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the Checkbox <bag> element.
+ */
+STATIC void
+_write_checkbox_bag(lxw_feature_property_bag *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("type", "Checkbox");
+
+    lxw_xml_empty_tag(self->file, "bag", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <bagId> element.
+ */
+STATIC void
+_write_bag_id(lxw_feature_property_bag *self, const char *key, int id)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+    char id_str[LXW_UINT32_T_LENGTH];
+
+    lxw_snprintf(id_str, LXW_UINT32_T_LENGTH, "%d", id);
+
+    LXW_INIT_ATTRIBUTES();
+    if (key && key[0] != '\0')
+        LXW_PUSH_ATTRIBUTES_STR("k", key);
+
+    lxw_xml_data_element(self->file, "bagId", id_str, &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the XFControls <bag> element.
+ */
+STATIC void
+_write_xf_controls_bag(lxw_feature_property_bag *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("type", "XFControls");
+
+    lxw_xml_start_tag(self->file, "bag", &attributes);
+
+    _write_bag_id(self, "CellControl", 0);
+
+    lxw_xml_end_tag(self->file, "bag");
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the XFComplement <bag> element.
+ */
+STATIC void
+_write_xf_complement_bag(lxw_feature_property_bag *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("type", "XFComplement");
+
+    lxw_xml_start_tag(self->file, "bag", &attributes);
+
+    _write_bag_id(self, "XFControls", 1);
+
+    lxw_xml_end_tag(self->file, "bag");
+
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the XFComplements <bag> element.
+ */
+STATIC void
+_write_xf_complements_bag(lxw_feature_property_bag *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("type", "XFComplements");
+    LXW_PUSH_ATTRIBUTES_STR("extRef", "XFComplementsMapperExtRef");
+
+    lxw_xml_start_tag(self->file, "bag", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("k", "MappedFeaturePropertyBags");
+    lxw_xml_start_tag(self->file, "a", &attributes);
+    LXW_FREE_ATTRIBUTES();
+
+    _write_bag_id(self, NULL, 2);
+
+    lxw_xml_end_tag(self->file, "a");
+    lxw_xml_end_tag(self->file, "bag");
+}
+
+/*
+ * Write the DXFComplements <bag> element.
+ */
+STATIC void
+_write_dxf_complements_bag(lxw_feature_property_bag *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("type", "DXFComplements");
+    LXW_PUSH_ATTRIBUTES_STR("extRef", "DXFComplementsMapperExtRef");
+
+    lxw_xml_start_tag(self->file, "bag", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("k", "MappedFeaturePropertyBags");
+    lxw_xml_start_tag(self->file, "a", &attributes);
+    LXW_FREE_ATTRIBUTES();
+
+    _write_bag_id(self, NULL, 2);
+
+    lxw_xml_end_tag(self->file, "a");
+    lxw_xml_end_tag(self->file, "bag");
+}
+
+/*****************************************************************************
+ *
+ * XML file assembly functions.
+ *
+ ****************************************************************************/
+
+/*
+ * Assemble and write the XML file.
+ */
+void
+lxw_feature_property_bag_assemble_xml_file(lxw_feature_property_bag *self)
+{
+    /* Write the XML declaration. */
+    _feature_property_bag_xml_declaration(self);
+
+    /* Write the FeaturePropertyBags element. */
+    _write_feature_property_bags(self);
+
+    /* Write the Checkbox bag element. */
+    _write_checkbox_bag(self);
+
+    /* Write the XFControls bag element. */
+    _write_xf_controls_bag(self);
+
+    /* Write the XFComplement bag element. */
+    _write_xf_complement_bag(self);
+
+    /* Write the XFComplements bag element. */
+    _write_xf_complements_bag(self);
+
+    /* Write the DXFComplements bag element if required. */
+    if (self->has_dxf_complements)
+        _write_dxf_complements_bag(self);
+
+    lxw_xml_end_tag(self->file, "FeaturePropertyBags");
+}
diff --git a/src/format.c b/src/format.c
index dde2fd86..dea02ac0 100644
--- a/src/format.c
+++ b/src/format.c
@@ -101,6 +101,8 @@ lxw_format_new(void)
 
     format->quote_prefix = LXW_FALSE;
 
+    format->checkbox = LXW_FALSE;
+
     return format;
 
 mem_error:
@@ -546,12 +548,6 @@ format_set_text_justlast(lxw_format *self)
 void
 format_set_pattern(lxw_format *self, uint8_t value)
 {
-    if (value > LXW_PATTERN_GRAY_0625) {
-        LXW_WARN_FORMAT1("format_set_pattern(): invalid pattern value: %d",
-                         value);
-        return;
-    }
-
     self->pattern = value;
 }
 
@@ -695,12 +691,6 @@ format_set_diag_color(lxw_format *self, lxw_color_t color)
 void
 format_set_diag_border(lxw_format *self, uint8_t style)
 {
-    if (style > LXW_BORDER_SLANT_DASH_DOT) {
-        LXW_WARN_FORMAT1("format_set_diag_border(): invalid border style: %d",
-                         style);
-        return;
-    }
-
     self->diag_border = style;
 }
 
@@ -719,13 +709,6 @@ format_set_num_format_index(lxw_format *self, uint8_t value)
 void
 format_set_valign(lxw_format *self, uint8_t value)
 {
-    if (value > LXW_ALIGN_VERTICAL_DISTRIBUTED) {
-        LXW_WARN_FORMAT1
-            ("format_set_valign(): invalid vertical alignment value: %d",
-             value);
-        return;
-    }
-
     self->text_v_align = value;
 }
 
@@ -830,3 +813,12 @@ format_set_quote_prefix(lxw_format *self)
 {
     self->quote_prefix = LXW_TRUE;
 }
+
+/*
+ * Set the checkbox property.
+ */
+void
+format_set_checkbox(lxw_format *self)
+{
+    self->checkbox = LXW_TRUE;
+}
diff --git a/src/labview_wrappers.c b/src/labview_wrappers.c
new file mode 100644
index 00000000..cb47538d
--- /dev/null
+++ b/src/labview_wrappers.c
@@ -0,0 +1,703 @@
+/*
+ * labview_wrappers.c - LabVIEW wrapper functions with ANSI to UTF-8 conversion
+ *
+ * These functions wrap the standard libxlsxwriter functions to convert
+ * ANSI-encoded strings (from LabVIEW) to UTF-8 before passing to the library.
+ *
+ * LabVIEW uses unsigned long (32-bit) to represent opaque pointer handles.
+ * These wrapper functions cast between the handle representation and actual pointers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ */
+
+#include "xlsxwriter.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* Handle type for LabVIEW compatibility (32-bit on x86, 64-bit handles need uintptr_t) */
+typedef uintptr_t lxw_handle;
+
+/*
+ * Convert ANSI string to UTF-8.
+ * Returns newly allocated UTF-8 string (caller must free) or NULL on failure.
+ */
+static char *
+ansi_to_utf8(const char *ansi_str)
+{
+    if (!ansi_str || !*ansi_str)
+        return NULL;
+
+    /* First convert ANSI to UTF-16 */
+    int wide_len = MultiByteToWideChar(CP_ACP, 0, ansi_str, -1, NULL, 0);
+    if (wide_len == 0)
+        return NULL;
+
+    wchar_t *wide_str = (wchar_t *) malloc(wide_len * sizeof(wchar_t));
+    if (!wide_str)
+        return NULL;
+
+    if (MultiByteToWideChar(CP_ACP, 0, ansi_str, -1, wide_str, wide_len) == 0) {
+        free(wide_str);
+        return NULL;
+    }
+
+    /* Then convert UTF-16 to UTF-8 */
+    int utf8_len =
+        WideCharToMultiByte(CP_UTF8, 0, wide_str, -1, NULL, 0, NULL, NULL);
+    if (utf8_len == 0) {
+        free(wide_str);
+        return NULL;
+    }
+
+    char *utf8_str = (char *) malloc(utf8_len);
+    if (!utf8_str) {
+        free(wide_str);
+        return NULL;
+    }
+
+    if (WideCharToMultiByte
+        (CP_UTF8, 0, wide_str, -1, utf8_str, utf8_len, NULL, NULL) == 0) {
+        free(wide_str);
+        free(utf8_str);
+        return NULL;
+    }
+
+    free(wide_str);
+    return utf8_str;
+}
+
+#else
+/* On non-Windows, assume strings are already UTF-8 */
+#include <stdlib.h>
+#include <string.h>
+
+static char *
+ansi_to_utf8(const char *str)
+{
+    if (!str)
+        return NULL;
+    return strdup(str);
+}
+#endif
+
+/* ============================================================================
+ * Worksheet write functions
+ * ============================================================================ */
+
+lxw_error
+worksheet_write_string_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                          lxw_col_t col, const char *string,
+                          lxw_format *format)
+{
+    char *utf8 = ansi_to_utf8(string);
+    lxw_error err =
+        worksheet_write_string(worksheet, row, col, utf8 ? utf8 : string,
+                               format);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_write_formula_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                           lxw_col_t col, const char *formula,
+                           lxw_format *format)
+{
+    char *utf8 = ansi_to_utf8(formula);
+    lxw_error err =
+        worksheet_write_formula(worksheet, row, col, utf8 ? utf8 : formula,
+                                format);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_write_url_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                       const char *url, lxw_format *format)
+{
+    char *utf8 = ansi_to_utf8(url);
+    lxw_error err =
+        worksheet_write_url(worksheet, row, col, utf8 ? utf8 : url, format);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_write_comment_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                           lxw_col_t col, const char *string)
+{
+    char *utf8 = ansi_to_utf8(string);
+    lxw_error err =
+        worksheet_write_comment(worksheet, row, col, utf8 ? utf8 : string);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_set_header_lv(lxw_worksheet *worksheet, const char *header)
+{
+    char *utf8 = ansi_to_utf8(header);
+    lxw_error err = worksheet_set_header(worksheet, utf8 ? utf8 : header);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_set_footer_lv(lxw_worksheet *worksheet, const char *footer)
+{
+    char *utf8 = ansi_to_utf8(footer);
+    lxw_error err = worksheet_set_footer(worksheet, utf8 ? utf8 : footer);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_merge_range_lv(lxw_worksheet *worksheet, lxw_row_t first_row,
+                         lxw_col_t first_col, lxw_row_t last_row,
+                         lxw_col_t last_col, const char *string,
+                         lxw_format *format)
+{
+    char *utf8 = ansi_to_utf8(string);
+    lxw_error err =
+        worksheet_merge_range(worksheet, first_row, first_col, last_row,
+                              last_col,
+                              utf8 ? utf8 : string, format);
+    free(utf8);
+    return err;
+}
+
+void
+worksheet_set_comments_author_lv(lxw_worksheet *worksheet, const char *author)
+{
+    char *utf8 = ansi_to_utf8(author);
+    worksheet_set_comments_author(worksheet, utf8 ? utf8 : author);
+    free(utf8);
+}
+
+lxw_error
+worksheet_insert_textbox_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                            lxw_col_t col, const char *text)
+{
+    char *utf8 = ansi_to_utf8(text);
+    lxw_error err =
+        worksheet_insert_textbox(worksheet, row, col, utf8 ? utf8 : text);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_insert_textbox_opt_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                                lxw_col_t col, const char *text,
+                                lxw_textbox_options *options)
+{
+    char *utf8 = ansi_to_utf8(text);
+    lxw_error err =
+        worksheet_insert_textbox_opt(worksheet, row, col, utf8 ? utf8 : text,
+                                     options);
+    free(utf8);
+    return err;
+}
+
+/* ============================================================================
+ * Chart functions
+ * ============================================================================ */
+
+lxw_chart_series *
+chart_add_series_lv(lxw_chart *chart, const char *categories,
+                    const char *values, uint8_t y2_axis)
+{
+    char *utf8_cat = ansi_to_utf8(categories);
+    char *utf8_val = ansi_to_utf8(values);
+    lxw_chart_series *series = chart_add_series_impl(chart,
+                                                     utf8_cat ? utf8_cat :
+                                                     categories,
+                                                     utf8_val ? utf8_val :
+                                                     values,
+                                                     y2_axis);
+    free(utf8_cat);
+    free(utf8_val);
+    return series;
+}
+
+void
+chart_series_set_name_lv(lxw_chart_series *series, const char *name)
+{
+    char *utf8 = ansi_to_utf8(name);
+    chart_series_set_name(series, utf8 ? utf8 : name);
+    free(utf8);
+}
+
+void
+chart_axis_set_name_lv(lxw_chart_axis *axis, const char *name)
+{
+    char *utf8 = ansi_to_utf8(name);
+    chart_axis_set_name(axis, utf8 ? utf8 : name);
+    free(utf8);
+}
+
+void
+chart_title_set_name_lv(lxw_chart *chart, const char *name)
+{
+    char *utf8 = ansi_to_utf8(name);
+    chart_title_set_name(chart, utf8 ? utf8 : name);
+    free(utf8);
+}
+
+void
+chart_series_set_trendline_name_lv(lxw_chart_series *series, const char *name)
+{
+    char *utf8 = ansi_to_utf8(name);
+    chart_series_set_trendline_name(series, utf8 ? utf8 : name);
+    free(utf8);
+}
+
+void
+chart_axis_set_num_format_lv(lxw_chart_axis *axis, const char *num_format)
+{
+    char *utf8 = ansi_to_utf8(num_format);
+    chart_axis_set_num_format(axis, utf8 ? utf8 : num_format);
+    free(utf8);
+}
+
+void
+chart_series_set_labels_num_format_lv(lxw_chart_series *series,
+                                      const char *num_format)
+{
+    char *utf8 = ansi_to_utf8(num_format);
+    chart_series_set_labels_num_format(series, utf8 ? utf8 : num_format);
+    free(utf8);
+}
+
+void
+chart_series_set_categories_lv(lxw_chart_series *series,
+                               const char *sheetname, lxw_row_t first_row,
+                               lxw_col_t first_col, lxw_row_t last_row,
+                               lxw_col_t last_col)
+{
+    char *utf8 = ansi_to_utf8(sheetname);
+    chart_series_set_categories(series, utf8 ? utf8 : sheetname,
+                                first_row, first_col, last_row, last_col);
+    free(utf8);
+}
+
+void
+chart_series_set_values_lv(lxw_chart_series *series, const char *sheetname,
+                           lxw_row_t first_row, lxw_col_t first_col,
+                           lxw_row_t last_row, lxw_col_t last_col)
+{
+    char *utf8 = ansi_to_utf8(sheetname);
+    chart_series_set_values(series, utf8 ? utf8 : sheetname,
+                            first_row, first_col, last_row, last_col);
+    free(utf8);
+}
+
+void
+chart_series_set_name_range_lv(lxw_chart_series *series,
+                               const char *sheetname, lxw_row_t row,
+                               lxw_col_t col)
+{
+    char *utf8 = ansi_to_utf8(sheetname);
+    chart_series_set_name_range(series, utf8 ? utf8 : sheetname, row, col);
+    free(utf8);
+}
+
+void
+chart_axis_set_name_range_lv(lxw_chart_axis *axis, const char *sheetname,
+                             lxw_row_t row, lxw_col_t col)
+{
+    char *utf8 = ansi_to_utf8(sheetname);
+    chart_axis_set_name_range(axis, utf8 ? utf8 : sheetname, row, col);
+    free(utf8);
+}
+
+void
+chart_title_set_name_range_lv(lxw_chart *chart, const char *sheetname,
+                              lxw_row_t row, lxw_col_t col)
+{
+    char *utf8 = ansi_to_utf8(sheetname);
+    chart_title_set_name_range(chart, utf8 ? utf8 : sheetname, row, col);
+    free(utf8);
+}
+
+/* ============================================================================
+ * Format functions
+ * ============================================================================ */
+
+void
+format_set_font_name_lv(lxw_format *format, const char *font_name)
+{
+    char *utf8 = ansi_to_utf8(font_name);
+    format_set_font_name(format, utf8 ? utf8 : font_name);
+    free(utf8);
+}
+
+void
+format_set_num_format_lv(lxw_format *format, const char *num_format)
+{
+    char *utf8 = ansi_to_utf8(num_format);
+    format_set_num_format(format, utf8 ? utf8 : num_format);
+    free(utf8);
+}
+
+/* ============================================================================
+ * Workbook functions
+ * ============================================================================ */
+
+lxw_worksheet *
+workbook_add_worksheet_lv(lxw_workbook *workbook, const char *sheetname)
+{
+    /* Pass NULL to get default Sheet1, Sheet2, etc. names */
+    if (!sheetname || !*sheetname) {
+        return workbook_add_worksheet(workbook, NULL);
+    }
+    char *utf8 = ansi_to_utf8(sheetname);
+    lxw_worksheet *ws =
+        workbook_add_worksheet(workbook, utf8 ? utf8 : sheetname);
+    free(utf8);
+    return ws;
+}
+
+lxw_chartsheet *
+workbook_add_chartsheet_lv(lxw_workbook *workbook, const char *sheetname)
+{
+    /* Pass NULL to get default Chart1, Chart2, etc. names */
+    if (!sheetname || !*sheetname) {
+        return workbook_add_chartsheet(workbook, NULL);
+    }
+    char *utf8 = ansi_to_utf8(sheetname);
+    lxw_chartsheet *cs =
+        workbook_add_chartsheet(workbook, utf8 ? utf8 : sheetname);
+    free(utf8);
+    return cs;
+}
+
+lxw_error
+workbook_define_name_lv(lxw_workbook *workbook, const char *name,
+                        const char *formula)
+{
+    char *utf8_name = ansi_to_utf8(name);
+    char *utf8_formula = ansi_to_utf8(formula);
+    lxw_error err = workbook_define_name(workbook,
+                                         utf8_name ? utf8_name : name,
+                                         utf8_formula ? utf8_formula :
+                                         formula);
+    free(utf8_name);
+    free(utf8_formula);
+    return err;
+}
+
+lxw_worksheet *
+workbook_get_worksheet_by_name_lv(lxw_workbook *workbook, const char *name)
+{
+    char *utf8 = ansi_to_utf8(name);
+    lxw_worksheet *ws =
+        workbook_get_worksheet_by_name(workbook, utf8 ? utf8 : name);
+    free(utf8);
+    return ws;
+}
+
+lxw_chartsheet *
+workbook_get_chartsheet_by_name_lv(lxw_workbook *workbook, const char *name)
+{
+    char *utf8 = ansi_to_utf8(name);
+    lxw_chartsheet *cs =
+        workbook_get_chartsheet_by_name(workbook, utf8 ? utf8 : name);
+    free(utf8);
+    return cs;
+}
+
+lxw_error
+workbook_validate_sheet_name_lv(lxw_workbook *workbook, const char *sheetname)
+{
+    char *utf8 = ansi_to_utf8(sheetname);
+    lxw_error err =
+        workbook_validate_sheet_name(workbook, utf8 ? utf8 : sheetname);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+workbook_set_custom_property_string_lv(lxw_workbook *workbook,
+                                       const char *name, const char *value)
+{
+    char *utf8_name = ansi_to_utf8(name);
+    char *utf8_value = ansi_to_utf8(value);
+    lxw_error err = workbook_set_custom_property_string(workbook,
+                                                        utf8_name ? utf8_name
+                                                        : name,
+                                                        utf8_value ?
+                                                        utf8_value : value);
+    free(utf8_name);
+    free(utf8_value);
+    return err;
+}
+
+/* ============================================================================
+ * Chartsheet functions
+ * ============================================================================ */
+
+lxw_error
+chartsheet_set_header_lv(lxw_chartsheet *chartsheet, const char *header)
+{
+    char *utf8 = ansi_to_utf8(header);
+    lxw_error err = chartsheet_set_header(chartsheet, utf8 ? utf8 : header);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+chartsheet_set_footer_lv(lxw_chartsheet *chartsheet, const char *footer)
+{
+    char *utf8 = ansi_to_utf8(footer);
+    lxw_error err = chartsheet_set_footer(chartsheet, utf8 ? utf8 : footer);
+    free(utf8);
+    return err;
+}
+
+/* ============================================================================
+ * File path functions (ANSI to UTF-8 conversion for lxw_fopen compatibility)
+ * ============================================================================ */
+
+lxw_workbook *
+workbook_new_lv(const char *filename)
+{
+    char *utf8 = ansi_to_utf8(filename);
+    lxw_workbook *wb = workbook_new(utf8 ? utf8 : filename);
+    free(utf8);
+    return wb;
+}
+
+lxw_workbook *
+workbook_new_opt_lv(const char *filename, lxw_workbook_options *options)
+{
+    char *utf8 = ansi_to_utf8(filename);
+    lxw_workbook *wb = workbook_new_opt(utf8 ? utf8 : filename, options);
+    free(utf8);
+    return wb;
+}
+
+lxw_error
+worksheet_insert_image_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                          lxw_col_t col, const char *filename)
+{
+    char *utf8 = ansi_to_utf8(filename);
+    lxw_error err =
+        worksheet_insert_image(worksheet, row, col, utf8 ? utf8 : filename);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_insert_image_opt_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                              lxw_col_t col, const char *filename,
+                              lxw_image_options *options)
+{
+    char *utf8 = ansi_to_utf8(filename);
+    lxw_error err =
+        worksheet_insert_image_opt(worksheet, row, col,
+                                   utf8 ? utf8 : filename, options);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_embed_image_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                         lxw_col_t col, const char *filename)
+{
+    char *utf8 = ansi_to_utf8(filename);
+    lxw_error err =
+        worksheet_embed_image(worksheet, row, col, utf8 ? utf8 : filename);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_embed_image_opt_lv(lxw_worksheet *worksheet, lxw_row_t row,
+                             lxw_col_t col, const char *filename,
+                             lxw_image_options *options)
+{
+    char *utf8 = ansi_to_utf8(filename);
+    lxw_error err =
+        worksheet_embed_image_opt(worksheet, row, col, utf8 ? utf8 : filename,
+                                  options);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+worksheet_set_background_lv(lxw_worksheet *worksheet, const char *filename)
+{
+    char *utf8 = ansi_to_utf8(filename);
+    lxw_error err =
+        worksheet_set_background(worksheet, utf8 ? utf8 : filename);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+workbook_add_vba_project_lv(lxw_workbook *workbook, const char *filename)
+{
+    char *utf8 = ansi_to_utf8(filename);
+    lxw_error err =
+        workbook_add_vba_project(workbook, utf8 ? utf8 : filename);
+    free(utf8);
+    return err;
+}
+
+lxw_error
+workbook_add_signed_vba_project_lv(lxw_workbook *workbook,
+                                   const char *vba_project,
+                                   const char *signature)
+{
+    char *utf8_vba = ansi_to_utf8(vba_project);
+    char *utf8_sig = ansi_to_utf8(signature);
+    lxw_error err = workbook_add_signed_vba_project(workbook,
+                                                    utf8_vba ? utf8_vba :
+                                                    vba_project,
+                                                    utf8_sig ? utf8_sig :
+                                                    signature);
+    free(utf8_vba);
+    free(utf8_sig);
+    return err;
+}
+
+/* ============================================================================
+ * Autofilter functions
+ * ============================================================================ */
+
+lxw_error
+worksheet_filter_column_lv(lxw_worksheet *worksheet, lxw_col_t col,
+                           uint8_t criteria, const char *value_string,
+                           double value)
+{
+    lxw_filter_rule rule = { 0 };
+    rule.criteria = criteria;
+    rule.value = value;
+
+    if (value_string && *value_string) {
+        char *utf8 = ansi_to_utf8(value_string);
+        rule.value_string = utf8 ? utf8 : value_string;
+        lxw_error err = worksheet_filter_column(worksheet, col, &rule);
+        free(utf8);
+        return err;
+    }
+    else {
+        rule.value_string = NULL;
+        return worksheet_filter_column(worksheet, col, &rule);
+    }
+}
+
+lxw_error
+worksheet_filter_column2_lv(lxw_worksheet *worksheet, lxw_col_t col,
+                            uint8_t criteria1, const char *value_string1,
+                            double value1, uint8_t criteria2,
+                            const char *value_string2, double value2,
+                            uint8_t and_or)
+{
+    lxw_filter_rule rule1 = { 0 };
+    lxw_filter_rule rule2 = { 0 };
+    char *utf8_1 = NULL;
+    char *utf8_2 = NULL;
+
+    rule1.criteria = criteria1;
+    rule1.value = value1;
+    rule2.criteria = criteria2;
+    rule2.value = value2;
+
+    if (value_string1 && *value_string1) {
+        utf8_1 = ansi_to_utf8(value_string1);
+        rule1.value_string = utf8_1 ? utf8_1 : value_string1;
+    }
+
+    if (value_string2 && *value_string2) {
+        utf8_2 = ansi_to_utf8(value_string2);
+        rule2.value_string = utf8_2 ? utf8_2 : value_string2;
+    }
+
+    lxw_error err =
+        worksheet_filter_column2(worksheet, col, &rule1, &rule2, and_or);
+
+    free(utf8_1);
+    free(utf8_2);
+    return err;
+}
+
+/* ============================================================================
+ * Chart data label functions
+ * ============================================================================ */
+
+lxw_error
+chart_series_set_labels_custom_lv(lxw_chart_series *series,
+                                  uintptr_t *values,
+                                  uint8_t *hide_flags, uint16_t count)
+{
+    lxw_error err = LXW_NO_ERROR;
+    uint16_t i;
+    lxw_chart_data_label *labels = NULL;
+    lxw_chart_data_label **label_ptrs = NULL;
+    char **utf8_values = NULL;
+
+    if (!series || count == 0)
+        return LXW_ERROR_NULL_PARAMETER_IGNORED;
+
+    /* Allocate arrays */
+    labels =
+        (lxw_chart_data_label *) calloc(count, sizeof(lxw_chart_data_label));
+    label_ptrs =
+        (lxw_chart_data_label **) calloc(count + 1,
+                                         sizeof(lxw_chart_data_label *));
+    utf8_values = (char **) calloc(count, sizeof(char *));
+
+    if (!labels || !label_ptrs || !utf8_values) {
+        free(labels);
+        free(label_ptrs);
+        free(utf8_values);
+        return LXW_ERROR_MEMORY_MALLOC_FAILED;
+    }
+
+    /* Build the label structs */
+    for (i = 0; i < count; i++) {
+        const char *str;
+
+        /* Set up pointer array */
+        label_ptrs[i] = &labels[i];
+
+        /* Get string pointer from uintptr_t array */
+        str = (values && values[i]) ? (const char *) values[i] : NULL;
+
+        /* Convert value string if provided */
+        if (str && str[0]) {
+            utf8_values[i] = ansi_to_utf8(str);
+            labels[i].value = utf8_values[i] ? utf8_values[i] : str;
+        }
+        else {
+            labels[i].value = NULL;
+        }
+
+        /* Set hide flag */
+        if (hide_flags) {
+            labels[i].hide = hide_flags[i];
+        }
+
+        /* Other fields remain NULL (font, line, fill, pattern) */
+    }
+
+    /* NULL-terminate the pointer array */
+    label_ptrs[count] = NULL;
+
+    /* Call the library function */
+    err = chart_series_set_labels_custom(series, label_ptrs);
+
+    /* Free allocated memory */
+    for (i = 0; i < count; i++) {
+        free(utf8_values[i]);
+    }
+    free(utf8_values);
+    free(labels);
+    free(label_ptrs);
+
+    return err;
+}
diff --git a/src/packager.c b/src/packager.c
index 4654bf63..41b2b894 100644
--- a/src/packager.c
+++ b/src/packager.c
@@ -1276,6 +1276,48 @@ mem_error:
     return err;
 }
 
+/*
+ * Write the featurePropertyBag.xml file.
+ */
+STATIC lxw_error
+_write_feature_property_bag_file(lxw_packager *self)
+{
+    lxw_error err = LXW_NO_ERROR;
+    lxw_feature_property_bag *feature_property_bag;
+    char *buffer = NULL;
+    size_t buffer_size = 0;
+
+    if (!self->workbook->has_feature_property_bags)
+        return LXW_NO_ERROR;
+
+    feature_property_bag = lxw_feature_property_bag_new();
+
+    if (!feature_property_bag) {
+        err = LXW_ERROR_MEMORY_MALLOC_FAILED;
+        goto mem_error;
+    }
+
+    feature_property_bag->file =
+        lxw_get_filehandle(&buffer, &buffer_size, self->tmpdir);
+    if (!feature_property_bag->file) {
+        err = LXW_ERROR_CREATING_TMPFILE;
+        goto mem_error;
+    }
+
+    lxw_feature_property_bag_assemble_xml_file(feature_property_bag);
+
+    err = _add_to_zip(self, feature_property_bag->file, &buffer, &buffer_size,
+                      "xl/featurePropertyBag/featurePropertyBag.xml");
+
+    fclose(feature_property_bag->file);
+    free(buffer);
+
+mem_error:
+    lxw_feature_property_bag_free(feature_property_bag);
+
+    return err;
+}
+
 /*
  * Write the custom.xml file.
  */
@@ -1539,6 +1581,9 @@ _write_content_types_file(lxw_packager *self)
     if (workbook->has_embedded_images)
         lxw_ct_add_rich_value(content_types);
 
+    if (workbook->has_feature_property_bags)
+        lxw_ct_add_feature_property_bag(content_types);
+
     lxw_content_types_assemble_xml_file(content_types);
 
     err = _add_to_zip(self, content_types->file, &buffer, &buffer_size,
@@ -1612,6 +1657,9 @@ _write_workbook_rels_file(lxw_packager *self)
     if (workbook->has_embedded_images)
         lxw_add_rich_value_relationship(rels);
 
+    if (workbook->has_feature_property_bags)
+        lxw_add_feature_property_bag_relationship(rels);
+
     lxw_relationships_assemble_xml_file(rels);
 
     err = _add_to_zip(self, rels->file, &buffer, &buffer_size,
@@ -2250,6 +2298,9 @@ lxw_create_package(lxw_packager *self)
     error = _write_rich_value_structure_file(self);
     RETURN_AND_ZIPCLOSE_ON_ERROR(error);
 
+    error = _write_feature_property_bag_file(self);
+    RETURN_AND_ZIPCLOSE_ON_ERROR(error);
+
     error = _write_rich_value_rels_file(self);
     RETURN_AND_ZIPCLOSE_ON_ERROR(error);
 
diff --git a/src/relationships.c b/src/relationships.c
index 4b7149cf..e062c3ca 100644
--- a/src/relationships.c
+++ b/src/relationships.c
@@ -267,3 +267,15 @@ lxw_add_rich_value_relationship(lxw_relationships *self)
                       NULL);
 
 }
+
+/*
+ * Add a featurePropertyBag relationship to workbook .rels xml files.
+ */
+void
+lxw_add_feature_property_bag_relationship(lxw_relationships *self)
+{
+    _add_relationship(self,
+                      "http://schemas.microsoft.com/office/2022/11/relationships/",
+                      "FeaturePropertyBag",
+                      "featurePropertyBag/featurePropertyBag.xml", NULL);
+}
diff --git a/src/styles.c b/src/styles.c
index cbfcaa8b..4fe04252 100644
--- a/src/styles.c
+++ b/src/styles.c
@@ -1187,6 +1187,34 @@ _write_protection(lxw_styles *self, lxw_format *format)
     LXW_FREE_ATTRIBUTES();
 }
 
+/*
+ * Write the xfComplement <extLst> elements for checkbox formats.
+ */
+STATIC void
+_write_xf_format_extensions(lxw_styles *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+
+    lxw_xml_start_tag(self->file, "extLst", NULL);
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("uri", "{C7286773-470A-42A8-94C5-96B5CB345126}");
+    LXW_PUSH_ATTRIBUTES_STR("xmlns:xfpb",
+                            "http://schemas.microsoft.com/office/spreadsheetml/2022/featurepropertybag");
+
+    lxw_xml_start_tag(self->file, "ext", &attributes);
+    LXW_FREE_ATTRIBUTES();
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("i", "0");
+    lxw_xml_empty_tag(self->file, "xfpb:xfComplement", &attributes);
+    LXW_FREE_ATTRIBUTES();
+
+    lxw_xml_end_tag(self->file, "ext");
+    lxw_xml_end_tag(self->file, "extLst");
+}
+
 /*
  * Write the <xf> element.
  */
@@ -1198,6 +1226,7 @@ _write_xf(lxw_styles *self, lxw_format *format)
     uint8_t has_protection = (!format->locked) | format->hidden;
     uint8_t has_alignment = _has_alignment(format);
     uint8_t apply_alignment = _apply_alignment(format);
+    uint8_t has_checkbox = format->checkbox;
 
     LXW_INIT_ATTRIBUTES();
     LXW_PUSH_ATTRIBUTES_INT("numFmtId", format->num_format_index);
@@ -1232,7 +1261,7 @@ _write_xf(lxw_styles *self, lxw_format *format)
         LXW_PUSH_ATTRIBUTES_STR("applyProtection", "1");
 
     /* Write XF with sub-elements if required. */
-    if (has_alignment || has_protection) {
+    if (has_alignment || has_protection || has_checkbox) {
         lxw_xml_start_tag(self->file, "xf", &attributes);
 
         if (has_alignment)
@@ -1241,6 +1270,9 @@ _write_xf(lxw_styles *self, lxw_format *format)
         if (has_protection)
             _write_protection(self, format);
 
+        if (has_checkbox)
+            _write_xf_format_extensions(self);
+
         lxw_xml_end_tag(self->file, "xf");
     }
     else {
diff --git a/src/utility.c b/src/utility.c
index 012474e0..a88425a5 100644
--- a/src/utility.c
+++ b/src/utility.c
@@ -41,7 +41,6 @@ char *error_strings[LXW_MAX_ERRNO + 1] = {
     "NULL function parameter ignored.",
     "Function parameter validation error.",
     "Function string parameter is empty.",
-    "Datetime struct parameter has an invalid field value.",
     "Worksheet name exceeds Excel's limit of 31 characters.",
     "Worksheet name cannot contain invalid characters: '[ ] : * ? / \\'",
     "Worksheet name cannot start or end with an apostrophe.",
@@ -333,69 +332,6 @@ lxw_name_to_col_2(const char *col_str)
         return 0;
 }
 
-lxw_error
-lxw_datetime_validate(lxw_datetime *datetime)
-{
-    if (!datetime)
-        return LXW_ERROR_DATETIME_VALIDATION;
-
-    /*
-     * Excel uses the year 1900 as the default epoch but it uses 1899-12-31 as
-     * the 0 date and internally we use the 0-0-0 date for time only values.
-     */
-    if (datetime->year < 1900 &&
-        !(datetime->year == 0 &&
-          datetime->month == 0 && datetime->day == 0) &&
-        !(datetime->year == 1899 &&
-          datetime->month == 12 && datetime->day == 31)) {
-
-        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid year: %d. "
-                         "Valid range is 1900-9999.", datetime->year);
-
-        return LXW_ERROR_DATETIME_VALIDATION;
-    }
-
-    if (datetime->year > 9999) {
-        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid year: %d. "
-                         "Valid range is 1900-9999.", datetime->year);
-        return LXW_ERROR_DATETIME_VALIDATION;
-    }
-
-    if (datetime->year != 0) {
-        if (datetime->month < 1 || datetime->month > 12) {
-            LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid month: %d. "
-                             "Valid range is 1-12.", datetime->month);
-            return LXW_ERROR_DATETIME_VALIDATION;
-        }
-
-        if (datetime->day < 1 || datetime->day > 31) {
-            LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid day: %d. "
-                             "Valid range is 1-31.", datetime->day);
-            return LXW_ERROR_DATETIME_VALIDATION;
-        }
-    }
-
-    if (datetime->hour < 0 || datetime->hour > 23) {
-        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid hour: %d. "
-                         "Valid range is 0-23.", datetime->hour);
-        return LXW_ERROR_DATETIME_VALIDATION;
-    }
-
-    if (datetime->min < 0 || datetime->min > 59) {
-        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid minute: %d. "
-                         "Valid range is 0-59.", datetime->min);
-        return LXW_ERROR_DATETIME_VALIDATION;
-    }
-
-    if (datetime->sec < 0.0 || datetime->sec >= 60.0) {
-        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid seconds: %.3f. "
-                         "Valid range is 0.0-59.999.", datetime->sec);
-        return LXW_ERROR_DATETIME_VALIDATION;
-    }
-
-    return LXW_NO_ERROR;
-}
-
 /*
  * Convert a lxw_datetime struct to an Excel serial date, with a 1900
  * or 1904 epoch.
@@ -421,9 +357,6 @@ lxw_datetime_to_excel_date_with_epoch(lxw_datetime *datetime,
     int days = 0;
     int i;
 
-    if (lxw_datetime_validate(datetime) != LXW_NO_ERROR)
-        return 0.0;
-
     /* For times without dates set the default date for the epoch. */
     if (!year) {
         if (!use_1904_epoch) {
@@ -749,6 +682,163 @@ lxw_hash_password(const char *password)
     return hash;
 }
 
+/*
+ * Character widths for Calibri 11 font, used for autofit calculations.
+ * Index 0 = space (ASCII 32), through index 94 = tilde (ASCII 126).
+ * Unhandled characters (including UTF-8) default to width 8.
+ */
+static const uint8_t char_widths[95] = {
+    3,                          /* space */
+    5,                          /* ! */
+    6,                          /* " */
+    7,                          /* # */
+    7,                          /* $ */
+    11,                         /* % */
+    10,                         /* & */
+    3,                          /* ' */
+    5,                          /* ( */
+    5,                          /* ) */
+    7,                          /* * */
+    7,                          /* + */
+    4,                          /* , */
+    5,                          /* - */
+    4,                          /* . */
+    6,                          /* / */
+    7,                          /* 0 */
+    7,                          /* 1 */
+    7,                          /* 2 */
+    7,                          /* 3 */
+    7,                          /* 4 */
+    7,                          /* 5 */
+    7,                          /* 6 */
+    7,                          /* 7 */
+    7,                          /* 8 */
+    7,                          /* 9 */
+    4,                          /* : */
+    4,                          /* ; */
+    7,                          /* < */
+    7,                          /* = */
+    7,                          /* > */
+    7,                          /* ? */
+    13,                         /* @ */
+    9,                          /* A */
+    8,                          /* B */
+    8,                          /* C */
+    9,                          /* D */
+    7,                          /* E */
+    7,                          /* F */
+    9,                          /* G */
+    9,                          /* H */
+    4,                          /* I */
+    5,                          /* J */
+    8,                          /* K */
+    6,                          /* L */
+    12,                         /* M */
+    10,                         /* N */
+    10,                         /* O */
+    8,                          /* P */
+    10,                         /* Q */
+    8,                          /* R */
+    7,                          /* S */
+    7,                          /* T */
+    9,                          /* U */
+    9,                          /* V */
+    13,                         /* W */
+    8,                          /* X */
+    7,                          /* Y */
+    7,                          /* Z */
+    5,                          /* [ */
+    6,                          /* backslash */
+    5,                          /* ] */
+    7,                          /* ^ */
+    7,                          /* _ */
+    4,                          /* ` */
+    7,                          /* a */
+    8,                          /* b */
+    6,                          /* c */
+    8,                          /* d */
+    8,                          /* e */
+    5,                          /* f */
+    7,                          /* g */
+    8,                          /* h */
+    4,                          /* i */
+    4,                          /* j */
+    7,                          /* k */
+    4,                          /* l */
+    12,                         /* m */
+    8,                          /* n */
+    8,                          /* o */
+    8,                          /* p */
+    8,                          /* q */
+    5,                          /* r */
+    6,                          /* s */
+    5,                          /* t */
+    8,                          /* u */
+    7,                          /* v */
+    11,                         /* w */
+    7,                          /* x */
+    7,                          /* y */
+    6,                          /* z */
+    5,                          /* { */
+    7,                          /* | */
+    5,                          /* } */
+    7                           /* ~ */
+};
+
+/*
+ * Calculate the pixel width of a string based on character widths.
+ */
+uint16_t
+lxw_pixel_width(const char *string)
+{
+    uint16_t length = 0;
+    unsigned char c;
+
+    if (string == NULL || *string == '\0')
+        return 0;
+
+    while ((c = (unsigned char) *string++) != '\0') {
+        /* Check if character is in the printable ASCII range (32-126) */
+        if (c >= 32 && c <= 126) {
+            length += char_widths[c - 32];
+        }
+        else {
+            /* Default width for non-ASCII characters (UTF-8, etc.) */
+            length += 8;
+        }
+    }
+
+    return length;
+}
+
+/*
+ * Calculate the column width required to autofit a string.
+ */
+double
+lxw_autofit_width(const char *string)
+{
+    uint16_t pixels;
+    double width;
+    const double max_digit_width = 7.0; /* For Calibri 11 */
+    const double padding = 5.0;
+
+    if (string == NULL || *string == '\0')
+        return 0.0;
+
+    /* Get pixel width and add 7 pixels padding like Excel */
+    pixels = lxw_pixel_width(string) + 7;
+
+    /* Convert pixels to column width using Excel's formula */
+    if (pixels <= 12) {
+        width = (double) pixels / (max_digit_width + padding);
+    }
+    else {
+        width = ((double) pixels - padding) / max_digit_width;
+    }
+
+    return width;
+}
+
 /* Make a simple portable version of fopen() for Windows. */
 #ifdef __MINGW32__
 #undef _WIN32
diff --git a/src/workbook.c b/src/workbook.c
index d31b1bf9..3caf0fad 100644
--- a/src/workbook.c
+++ b/src/workbook.c
@@ -13,7 +13,6 @@
 #include "xlsxwriter/utility.h"
 #include "xlsxwriter/packager.h"
 #include "xlsxwriter/hash_table.h"
-#include "xlsxwriter/hash_table.h"
 
 STATIC int _worksheet_name_cmp(lxw_worksheet_name *name1,
                                lxw_worksheet_name *name2);
@@ -300,8 +299,8 @@ lxw_workbook_set_default_xf_indices(lxw_workbook *self)
 
     STAILQ_FOREACH(format, self->formats, list_pointers) {
 
-        /* Skip the hyperlink format. */
-        if (index != 1)
+        /* Skip the hyperlink format (index 1) and checkbox format (index 2). */
+        if (index != 1 && index != 2)
             lxw_format_get_xf_index(format);
 
         index++;
@@ -1038,6 +1037,8 @@ _add_chart_cache_data(lxw_workbook *self)
         _populate_range(self, chart->title.range);
         _populate_range(self, chart->x_axis->title.range);
         _populate_range(self, chart->y_axis->title.range);
+        _populate_range(self, chart->x2_axis->title.range);
+        _populate_range(self, chart->y2_axis->title.range);
 
         if (STAILQ_EMPTY(chart->series_list))
             continue;
@@ -1052,6 +1053,31 @@ _add_chart_cache_data(lxw_workbook *self)
                 _populate_range(self, data_label->range);
             }
         }
+
+        /* Also populate data for combined charts. */
+        if (chart->combined) {
+            lxw_chart *combined = chart->combined;
+
+            _populate_range(self, combined->title.range);
+            _populate_range(self, combined->x_axis->title.range);
+            _populate_range(self, combined->y_axis->title.range);
+            _populate_range(self, combined->x2_axis->title.range);
+            _populate_range(self, combined->y2_axis->title.range);
+
+            if (!STAILQ_EMPTY(combined->series_list)) {
+                STAILQ_FOREACH(series, combined->series_list, list_pointers) {
+                    _populate_range(self, series->categories);
+                    _populate_range(self, series->values);
+                    _populate_range(self, series->title.range);
+
+                    for (i = 0; i < series->data_label_count; i++) {
+                        lxw_chart_custom_label *data_label =
+                            &series->data_labels[i];
+                        _populate_range(self, data_label->range);
+                    }
+                }
+            }
+        }
     }
 }
 
@@ -1106,6 +1132,7 @@ _prepare_drawings(lxw_workbook *self)
         if (STAILQ_EMPTY(worksheet->image_props)
             && STAILQ_EMPTY(worksheet->embedded_image_props)
             && STAILQ_EMPTY(worksheet->chart_data)
+            && STAILQ_EMPTY(worksheet->textbox_data)
             && !worksheet->has_header_vml && !worksheet->has_background_image) {
             continue;
         }
@@ -1243,6 +1270,12 @@ _prepare_drawings(lxw_workbook *self)
                                    ordered_list_pointers);
         }
 
+        /* Prepare worksheet textboxes. */
+        STAILQ_FOREACH(object_props, worksheet->textbox_data, list_pointers) {
+            lxw_worksheet_prepare_textbox(worksheet, drawing_id,
+                                          object_props);
+        }
+
         /* Prepare worksheet header/footer images. */
         for (i = 0; i < LXW_HEADER_FOOTER_OBJS_MAX; i++) {
 
@@ -1968,6 +2001,12 @@ workbook_new_opt(const char *filename, lxw_workbook_options *options)
     format_set_hyperlink(format);
     workbook->default_url_format = format;
 
+    /* Add the default checkbox format. */
+    format = workbook_add_format(workbook);
+    GOTO_LABEL_ON_MEM_ERROR(format, mem_error);
+    format_set_checkbox(format);
+    workbook->checkbox_format = format;
+
     if (options) {
         workbook->options.constant_memory = options->constant_memory;
         workbook->options.tmpdir = lxw_strdup(options->tmpdir);
@@ -2039,6 +2078,7 @@ workbook_add_worksheet(lxw_workbook *self, const char *sheetname)
     init_data.first_sheet = &self->first_sheet;
     init_data.tmpdir = self->options.tmpdir;
     init_data.default_url_format = self->default_url_format;
+    init_data.checkbox_format = self->checkbox_format;
     init_data.max_url_length = self->max_url_length;
     init_data.use_1904_epoch = self->use_1904_epoch;
 
@@ -2167,12 +2207,6 @@ workbook_add_chart(lxw_workbook *self, uint8_t type)
 {
     lxw_chart *chart;
 
-    if (type == LXW_CHART_NONE || type > LXW_CHART_RADAR_FILLED) {
-        LXW_WARN_FORMAT1("workbook_add_chart(): invalid chart type: %d",
-                         type);
-        return NULL;
-    }
-
     /* Create a new chart object. */
     chart = lxw_chart_new(type);
 
@@ -2247,6 +2281,9 @@ workbook_close(lxw_workbook *self)
             self->has_metadata = LXW_TRUE;
             self->has_embedded_images = LXW_TRUE;
         }
+
+        if (worksheet->has_checkboxes)
+            self->has_feature_property_bags = LXW_TRUE;
     }
 
     /* Set workbook and worksheet VBA codenames if a macro has been added. */
@@ -2660,10 +2697,6 @@ workbook_set_custom_property_datetime(lxw_workbook *self, const char *name,
         return LXW_ERROR_NULL_PARAMETER_IGNORED;
     }
 
-    if (lxw_datetime_validate(datetime) != LXW_NO_ERROR) {
-        return LXW_ERROR_DATETIME_VALIDATION;
-    }
-
     /* Create a struct to hold the custom property. */
     custom_property = calloc(1, sizeof(struct lxw_custom_property));
     RETURN_ON_MEM_ERROR(custom_property, LXW_ERROR_MEMORY_MALLOC_FAILED);
diff --git a/src/worksheet.c b/src/worksheet.c
index 7fe438b4..f3ce0617 100644
--- a/src/worksheet.c
+++ b/src/worksheet.c
@@ -151,6 +151,10 @@ lxw_worksheet_new(lxw_worksheet_init_data *init_data)
     GOTO_LABEL_ON_MEM_ERROR(worksheet->chart_data, mem_error);
     STAILQ_INIT(worksheet->chart_data);
 
+    worksheet->textbox_data = calloc(1, sizeof(struct lxw_textbox_props));
+    GOTO_LABEL_ON_MEM_ERROR(worksheet->textbox_data, mem_error);
+    STAILQ_INIT(worksheet->textbox_data);
+
     worksheet->comment_objs = calloc(1, sizeof(struct lxw_comment_objs));
     GOTO_LABEL_ON_MEM_ERROR(worksheet->comment_objs, mem_error);
     STAILQ_INIT(worksheet->comment_objs);
@@ -176,6 +180,10 @@ lxw_worksheet_new(lxw_worksheet_init_data *init_data)
     GOTO_LABEL_ON_MEM_ERROR(worksheet->table_objs, mem_error);
     STAILQ_INIT(worksheet->table_objs);
 
+    worksheet->sparklines = calloc(1, sizeof(struct lxw_sparklines));
+    GOTO_LABEL_ON_MEM_ERROR(worksheet->sparklines, mem_error);
+    STAILQ_INIT(worksheet->sparklines);
+
     worksheet->external_hyperlinks = calloc(1, sizeof(struct lxw_rel_tuples));
     GOTO_LABEL_ON_MEM_ERROR(worksheet->external_hyperlinks, mem_error);
     STAILQ_INIT(worksheet->external_hyperlinks);
@@ -293,6 +301,7 @@ lxw_worksheet_new(lxw_worksheet_init_data *init_data)
         worksheet->active_sheet = init_data->active_sheet;
         worksheet->first_sheet = init_data->first_sheet;
         worksheet->default_url_format = init_data->default_url_format;
+        worksheet->checkbox_format = init_data->checkbox_format;
         worksheet->max_url_length = init_data->max_url_length;
         worksheet->use_1904_epoch = init_data->use_1904_epoch;
     }
@@ -427,6 +436,7 @@ _free_object_properties(lxw_object_properties *object_property)
     free(object_property->image_buffer);
     free(object_property->md5);
     free(object_property->image_position);
+    free(object_property->text);
     free(object_property);
     object_property = NULL;
 }
@@ -635,6 +645,16 @@ lxw_worksheet_free(lxw_worksheet *worksheet)
         free(worksheet->chart_data);
     }
 
+    if (worksheet->textbox_data) {
+        while (!STAILQ_EMPTY(worksheet->textbox_data)) {
+            object_props = STAILQ_FIRST(worksheet->textbox_data);
+            STAILQ_REMOVE_HEAD(worksheet->textbox_data, list_pointers);
+            _free_object_properties(object_props);
+        }
+
+        free(worksheet->textbox_data);
+    }
+
     /* Just free the list. The list objects are freed from the RB tree. */
     free(worksheet->comment_objs);
 
@@ -678,6 +698,20 @@ lxw_worksheet_free(lxw_worksheet *worksheet)
         free(worksheet->table_objs);
     }
 
+    if (worksheet->sparklines) {
+        lxw_sparkline *sparkline;
+        while (!STAILQ_EMPTY(worksheet->sparklines)) {
+            sparkline = STAILQ_FIRST(worksheet->sparklines);
+            STAILQ_REMOVE_HEAD(worksheet->sparklines, list_pointers);
+            free(sparkline->range);
+            free(sparkline->location);
+            free(sparkline->date_axis);
+            free(sparkline);
+        }
+
+        free(worksheet->sparklines);
+    }
+
     if (worksheet->data_validations) {
         while (!STAILQ_EMPTY(worksheet->data_validations)) {
             data_validation = STAILQ_FIRST(worksheet->data_validations);
@@ -3007,15 +3041,13 @@ _worksheet_position_object_pixels(lxw_worksheet *self,
         height = height + y1;
 
     /* Subtract the underlying cell widths to find the end cell. */
-    while (width >= _worksheet_size_col(self, col_end, anchor)
-           && col_end < LXW_COL_MAX) {
+    while (width >= _worksheet_size_col(self, col_end, anchor)) {
         width -= _worksheet_size_col(self, col_end, anchor);
         col_end++;
     }
 
     /* Subtract the underlying cell heights to find the end cell. */
-    while (height >= _worksheet_size_row(self, row_end, anchor)
-           && row_end < LXW_ROW_MAX) {
+    while (height >= _worksheet_size_row(self, row_end, anchor)) {
         height -= _worksheet_size_row(self, row_end, anchor);
         row_end++;
     }
@@ -3705,6 +3737,83 @@ mem_error:
     }
 }
 
+/*
+ * Set up a textbox in the worksheet.
+ */
+void
+lxw_worksheet_prepare_textbox(lxw_worksheet *self,
+                              uint32_t drawing_id,
+                              lxw_object_properties *object_props)
+{
+    lxw_drawing_object *drawing_object;
+    lxw_rel_tuple *relationship;
+    double width;
+    double height;
+    char filename[LXW_FILENAME_LENGTH];
+
+    if (!self->drawing) {
+        self->drawing = lxw_drawing_new();
+        RETURN_VOID_ON_MEM_ERROR(self->drawing);
+        self->drawing->embedded = LXW_TRUE;
+
+        relationship = calloc(1, sizeof(lxw_rel_tuple));
+        RETURN_VOID_ON_MEM_ERROR(relationship);
+
+        relationship->type = lxw_strdup("/drawing");
+        GOTO_LABEL_ON_MEM_ERROR(relationship->type, mem_error);
+
+        lxw_snprintf(filename, LXW_FILENAME_LENGTH,
+                     "../drawings/drawing%d.xml", drawing_id);
+
+        relationship->target = lxw_strdup(filename);
+        GOTO_LABEL_ON_MEM_ERROR(relationship->target, mem_error);
+
+        STAILQ_INSERT_TAIL(self->external_drawing_links, relationship,
+                           list_pointers);
+    }
+
+    drawing_object = calloc(1, sizeof(lxw_drawing_object));
+    RETURN_VOID_ON_MEM_ERROR(drawing_object);
+
+    drawing_object->anchor = LXW_OBJECT_MOVE_AND_SIZE;
+    if (object_props->object_position)
+        drawing_object->anchor = object_props->object_position;
+
+    drawing_object->type = LXW_DRAWING_SHAPE;
+    drawing_object->description = lxw_strdup(object_props->description);
+    drawing_object->tip = NULL;
+    drawing_object->rel_index = 0;
+    drawing_object->url_rel_index = 0;
+    drawing_object->decorative = object_props->decorative;
+    drawing_object->text = lxw_strdup(object_props->text);
+
+    /* Scale to user scale. */
+    width = object_props->width * object_props->x_scale;
+    height = object_props->height * object_props->y_scale;
+
+    /* Convert to the nearest pixel. */
+    object_props->width = width;
+    object_props->height = height;
+
+    _worksheet_position_object_emus(self, object_props, drawing_object);
+
+    /* Convert from pixels to emus. */
+    drawing_object->width = (uint32_t) (0.5 + width * 9525);
+    drawing_object->height = (uint32_t) (0.5 + height * 9525);
+
+    lxw_add_drawing_object(self->drawing, drawing_object);
+
+    return;
+
+mem_error:
+    if (relationship) {
+        free(relationship->type);
+        free(relationship->target);
+        free(relationship->target_mode);
+        free(relationship);
+    }
+}
+
 /*
  * Set up VML objects, such as comments, in the worksheet.
  */
@@ -7156,6 +7265,218 @@ _worksheet_write_conditional_formatting_2010(lxw_worksheet *self, lxw_cond_forma
     LXW_FREE_ATTRIBUTES();
 }
 
+/*
+ * Write a sparkline color element like <x14:colorSeries>.
+ * Color of 0 (LXW_COLOR_UNSET) means "not set, use default".
+ */
+STATIC void
+_worksheet_write_sparkline_color(lxw_worksheet *self, const char *tag,
+                                 lxw_color_t color)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+    char rgb_str[LXW_ATTR_32];
+
+    /* 0 means not set, use Excel's default for this style. */
+    if (color == 0)
+        return;
+
+    lxw_snprintf(rgb_str, LXW_ATTR_32, "FF%06X", color & LXW_COLOR_MASK);
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("rgb", rgb_str);
+    lxw_xml_empty_tag(self->file, tag, &attributes);
+    LXW_FREE_ATTRIBUTES();
+}
+
+/*
+ * Write the <x14:sparklineGroup> element.
+ */
+STATIC void
+_worksheet_write_sparkline_group(lxw_worksheet *self,
+                                 lxw_sparkline *sparkline)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+    char double_str[LXW_ATTR_32];
+
+    LXW_INIT_ATTRIBUTES();
+
+    /* Write manualMax if custom max. */
+    if (sparkline->max_axis_type == LXW_SPARKLINE_AXIS_CUSTOM) {
+        lxw_sprintf_dbl(double_str, sparkline->max);
+        LXW_PUSH_ATTRIBUTES_STR("manualMax", double_str);
+    }
+
+    /* Write manualMin if custom min. */
+    if (sparkline->min_axis_type == LXW_SPARKLINE_AXIS_CUSTOM) {
+        lxw_sprintf_dbl(double_str, sparkline->min);
+        LXW_PUSH_ATTRIBUTES_STR("manualMin", double_str);
+    }
+
+    /* Write lineWeight (default is 0.75 but we always write if non-default). */
+    if (sparkline->weight != 0.75) {
+        lxw_sprintf_dbl(double_str, sparkline->weight);
+        LXW_PUSH_ATTRIBUTES_STR("lineWeight", double_str);
+    }
+
+    /* Write type (line is default, so only write column or win/loss). */
+    if (sparkline->type == LXW_SPARKLINE_COLUMN) {
+        LXW_PUSH_ATTRIBUTES_STR("type", "column");
+    }
+    else if (sparkline->type == LXW_SPARKLINE_WIN_LOSS) {
+        LXW_PUSH_ATTRIBUTES_STR("type", "stacked");
+    }
+
+    /* Write dateAxis if date axis data is present. */
+    if (sparkline->date_axis) {
+        LXW_PUSH_ATTRIBUTES_STR("dateAxis", "1");
+    }
+
+    /* Write displayEmptyCellsAs. */
+    if (sparkline->empty_cells == LXW_SPARKLINE_EMPTY_CELLS_ZERO) {
+        LXW_PUSH_ATTRIBUTES_STR("displayEmptyCellsAs", "zero");
+    }
+    else if (sparkline->empty_cells == LXW_SPARKLINE_EMPTY_CELLS_SPAN) {
+        LXW_PUSH_ATTRIBUTES_STR("displayEmptyCellsAs", "span");
+    }
+
+    /* Write markers. */
+    if (sparkline->markers) {
+        LXW_PUSH_ATTRIBUTES_STR("markers", "1");
+    }
+
+    /* Write high. */
+    if (sparkline->high_point) {
+        LXW_PUSH_ATTRIBUTES_STR("high", "1");
+    }
+
+    /* Write low. */
+    if (sparkline->low_point) {
+        LXW_PUSH_ATTRIBUTES_STR("low", "1");
+    }
+
+    /* Write first. */
+    if (sparkline->first_point) {
+        LXW_PUSH_ATTRIBUTES_STR("first", "1");
+    }
+
+    /* Write last. */
+    if (sparkline->last_point) {
+        LXW_PUSH_ATTRIBUTES_STR("last", "1");
+    }
+
+    /* Write negative. */
+    if (sparkline->negative_points) {
+        LXW_PUSH_ATTRIBUTES_STR("negative", "1");
+    }
+
+    /* Write displayXAxis. */
+    if (sparkline->show_axis) {
+        LXW_PUSH_ATTRIBUTES_STR("displayXAxis", "1");
+    }
+
+    /* Write displayHidden. */
+    if (sparkline->show_hidden) {
+        LXW_PUSH_ATTRIBUTES_STR("displayHidden", "1");
+    }
+
+    /* Write minAxisType. */
+    if (sparkline->min_axis_type == LXW_SPARKLINE_AXIS_GROUP) {
+        LXW_PUSH_ATTRIBUTES_STR("minAxisType", "group");
+    }
+    else if (sparkline->min_axis_type == LXW_SPARKLINE_AXIS_CUSTOM) {
+        LXW_PUSH_ATTRIBUTES_STR("minAxisType", "custom");
+    }
+
+    /* Write maxAxisType. */
+    if (sparkline->max_axis_type == LXW_SPARKLINE_AXIS_GROUP) {
+        LXW_PUSH_ATTRIBUTES_STR("maxAxisType", "group");
+    }
+    else if (sparkline->max_axis_type == LXW_SPARKLINE_AXIS_CUSTOM) {
+        LXW_PUSH_ATTRIBUTES_STR("maxAxisType", "custom");
+    }
+
+    /* Write rightToLeft. */
+    if (sparkline->reverse) {
+        LXW_PUSH_ATTRIBUTES_STR("rightToLeft", "1");
+    }
+
+    lxw_xml_start_tag(self->file, "x14:sparklineGroup", &attributes);
+
+    LXW_FREE_ATTRIBUTES();
+
+    /* Write colors. */
+    _worksheet_write_sparkline_color(self, "x14:colorSeries",
+                                     sparkline->series_color);
+    _worksheet_write_sparkline_color(self, "x14:colorNegative",
+                                     sparkline->negative_color);
+
+    /* Write the colorAxis element (always black FF000000). */
+    {
+        struct xml_attribute_list attributes;
+        struct xml_attribute *attribute;
+        LXW_INIT_ATTRIBUTES();
+        LXW_PUSH_ATTRIBUTES_STR("rgb", "FF000000");
+        lxw_xml_empty_tag(self->file, "x14:colorAxis", &attributes);
+        LXW_FREE_ATTRIBUTES();
+    }
+
+    _worksheet_write_sparkline_color(self, "x14:colorMarkers",
+                                     sparkline->markers_color);
+    _worksheet_write_sparkline_color(self, "x14:colorFirst",
+                                     sparkline->first_color);
+    _worksheet_write_sparkline_color(self, "x14:colorLast",
+                                     sparkline->last_color);
+    _worksheet_write_sparkline_color(self, "x14:colorHigh",
+                                     sparkline->high_color);
+    _worksheet_write_sparkline_color(self, "x14:colorLow",
+                                     sparkline->low_color);
+
+    /* Write date axis formula if present. */
+    if (sparkline->date_axis) {
+        lxw_xml_data_element(self->file, "xm:f", sparkline->date_axis, NULL);
+    }
+
+    /* Write the sparklines container. */
+    lxw_xml_start_tag(self->file, "x14:sparklines", NULL);
+
+    /* Write the sparkline element. */
+    lxw_xml_start_tag(self->file, "x14:sparkline", NULL);
+    lxw_xml_data_element(self->file, "xm:f", sparkline->range, NULL);
+    lxw_xml_data_element(self->file, "xm:sqref", sparkline->location, NULL);
+    lxw_xml_end_tag(self->file, "x14:sparkline");
+
+    lxw_xml_end_tag(self->file, "x14:sparklines");
+    lxw_xml_end_tag(self->file, "x14:sparklineGroup");
+}
+
+/*
+ * Write the <extLst> element for sparklines.
+ */
+STATIC void
+_worksheet_write_ext_list_sparklines(lxw_worksheet *self)
+{
+    struct xml_attribute_list attributes;
+    struct xml_attribute *attribute;
+    lxw_sparkline *sparkline;
+    char xmlns_xm[] = "http://schemas.microsoft.com/office/excel/2006/main";
+
+    _worksheet_write_ext(self, "{05C60535-1F16-4fd2-B633-F4F36F0B64E0}");
+
+    LXW_INIT_ATTRIBUTES();
+    LXW_PUSH_ATTRIBUTES_STR("xmlns:xm", xmlns_xm);
+    lxw_xml_start_tag(self->file, "x14:sparklineGroups", &attributes);
+    LXW_FREE_ATTRIBUTES();
+
+    STAILQ_FOREACH(sparkline, self->sparklines, list_pointers) {
+        _worksheet_write_sparkline_group(self, sparkline);
+    }
+
+    lxw_xml_end_tag(self->file, "x14:sparklineGroups");
+    lxw_xml_end_tag(self->file, "ext");
+}
+
 /*
  * Write the <extLst> element for Excel 2010 conditional formatting data bars.
  */
@@ -7187,12 +7508,16 @@ _worksheet_write_ext_list_data_bars(lxw_worksheet *self)
 STATIC void
 _worksheet_write_ext_list(lxw_worksheet *self)
 {
-    if (self->data_bar_2010_index == 0)
+    if (self->data_bar_2010_index == 0 && !self->has_sparklines)
         return;
 
     lxw_xml_start_tag(self->file, "extLst", NULL);
 
-    _worksheet_write_ext_list_data_bars(self);
+    if (self->data_bar_2010_index > 0)
+        _worksheet_write_ext_list_data_bars(self);
+
+    if (self->has_sparklines)
+        _worksheet_write_ext_list_sparklines(self);
 
     lxw_xml_end_tag(self->file, "extLst");
 }
@@ -8317,6 +8642,30 @@ worksheet_write_boolean(lxw_worksheet *self,
     return LXW_NO_ERROR;
 }
 
+/*
+ * Write a checkbox to a cell in Excel.
+ */
+lxw_error
+worksheet_insert_checkbox(lxw_worksheet *self,
+                          lxw_row_t row_num, lxw_col_t col_num, int value)
+{
+    lxw_cell *cell;
+    lxw_error err;
+
+    err = _check_dimensions(self, row_num, col_num, LXW_FALSE, LXW_FALSE);
+    if (err)
+        return err;
+
+    cell = _new_boolean_cell(row_num, col_num, value ? 1 : 0,
+                             self->checkbox_format);
+
+    _insert_cell(self, row_num, col_num, cell);
+
+    self->has_checkboxes = LXW_TRUE;
+
+    return LXW_NO_ERROR;
+}
+
 /*
  * Write a date and or time to a cell in Excel.
  */
@@ -8334,9 +8683,9 @@ worksheet_write_datetime(lxw_worksheet *self,
     if (err)
         return err;
 
-    err = lxw_datetime_validate(datetime);
-    if (err)
-        return err;
+    printf("worksheet_write_datetime(): %d-%02d-%02d - 1904: %d\n",
+           datetime->year, datetime->month, datetime->day,
+           self->use_1904_epoch);
 
     excel_date =
         lxw_datetime_to_excel_date_with_epoch(datetime, self->use_1904_epoch);
@@ -9556,6 +9905,104 @@ error:
 
 }
 
+/*
+ * Add a sparkline to the worksheet.
+ */
+lxw_error
+worksheet_add_sparkline(lxw_worksheet *self, lxw_row_t row, lxw_col_t col,
+                        lxw_sparkline_options *user_options)
+{
+    lxw_sparkline *sparkline;
+    lxw_error err;
+    char location[LXW_MAX_CELL_NAME_LENGTH];
+
+    if (!user_options) {
+        LXW_WARN
+            ("worksheet_add_sparkline(): options parameter cannot be NULL");
+        return LXW_ERROR_NULL_PARAMETER_IGNORED;
+    }
+
+    if (!user_options->range || user_options->range[0] == '\0') {
+        LXW_WARN("worksheet_add_sparkline(): range parameter is required");
+        return LXW_ERROR_NULL_PARAMETER_IGNORED;
+    }
+
+    /* Check that row and column are valid. */
+    err = _check_dimensions(self, row, col, LXW_FALSE, LXW_FALSE);
+    if (err)
+        return err;
+
+    /* Create sparkline object. */
+    sparkline = calloc(1, sizeof(lxw_sparkline));
+    RETURN_ON_MEM_ERROR(sparkline, LXW_ERROR_MEMORY_MALLOC_FAILED);
+
+    /* Copy required range. */
+    sparkline->range = lxw_strdup(user_options->range);
+    if (!sparkline->range) {
+        free(sparkline);
+        return LXW_ERROR_MEMORY_MALLOC_FAILED;
+    }
+
+    /* Set location from row/col. */
+    lxw_rowcol_to_cell(location, row, col);
+    sparkline->location = lxw_strdup(location);
+    if (!sparkline->location) {
+        free(sparkline->range);
+        free(sparkline);
+        return LXW_ERROR_MEMORY_MALLOC_FAILED;
+    }
+
+    sparkline->row = row;
+    sparkline->col = col;
+
+    /* Copy options. */
+    sparkline->type = user_options->type;
+    sparkline->style = user_options->style;
+    sparkline->high_point = user_options->high_point;
+    sparkline->low_point = user_options->low_point;
+    sparkline->negative_points = user_options->negative_points;
+    sparkline->first_point = user_options->first_point;
+    sparkline->last_point = user_options->last_point;
+    sparkline->markers = user_options->markers;
+
+    sparkline->series_color = user_options->series_color;
+    sparkline->negative_color = user_options->negative_color;
+    sparkline->markers_color = user_options->markers_color;
+    sparkline->first_color = user_options->first_color;
+    sparkline->last_color = user_options->last_color;
+    sparkline->high_color = user_options->high_color;
+    sparkline->low_color = user_options->low_color;
+
+    sparkline->min = user_options->min;
+    sparkline->max = user_options->max;
+    sparkline->min_axis_type = user_options->min_axis_type;
+    sparkline->max_axis_type = user_options->max_axis_type;
+
+    sparkline->show_axis = user_options->show_axis;
+    sparkline->reverse = user_options->reverse;
+    sparkline->show_hidden = user_options->show_hidden;
+    sparkline->empty_cells = user_options->empty_cells;
+
+    sparkline->weight = user_options->weight;
+    if (sparkline->weight == 0.0)
+        sparkline->weight = 0.75;       /* Default line weight */
+
+    if (user_options->date_axis) {
+        sparkline->date_axis = lxw_strdup(user_options->date_axis);
+        if (!sparkline->date_axis) {
+            free(sparkline->range);
+            free(sparkline->location);
+            free(sparkline);
+            return LXW_ERROR_MEMORY_MALLOC_FAILED;
+        }
+    }
+
+    STAILQ_INSERT_TAIL(self->sparklines, sparkline, list_pointers);
+    self->has_sparklines = LXW_TRUE;
+
+    return LXW_NO_ERROR;
+}
+
 /*
  * Set this worksheet as a selected worksheet, i.e. the worksheet has its tab
  * highlighted.
@@ -9795,12 +10242,6 @@ worksheet_set_page_view(lxw_worksheet *self)
 void
 worksheet_set_paper(lxw_worksheet *self, uint8_t paper_size)
 {
-    if (paper_size > 118) {
-        LXW_WARN_FORMAT1("worksheet_set_paper(): invalid paper size: %d. "
-                         "Valid range is 0-118", paper_size);
-        return;
-    }
-
     self->paper_size = paper_size;
     self->page_setup_changed = LXW_TRUE;
 }
@@ -11139,6 +11580,79 @@ worksheet_insert_chart(lxw_worksheet *self,
     return worksheet_insert_chart_opt(self, row_num, col_num, chart, NULL);
 }
 
+/*
+ * Insert a textbox into the worksheet, with options.
+ */
+lxw_error
+worksheet_insert_textbox_opt(lxw_worksheet *self,
+                             lxw_row_t row_num, lxw_col_t col_num,
+                             const char *text,
+                             lxw_textbox_options *user_options)
+{
+    lxw_object_properties *object_props;
+
+    if (!text) {
+        LXW_WARN("worksheet_insert_textbox()/_opt(): "
+                 "text must be specified.");
+        return LXW_ERROR_NULL_PARAMETER_IGNORED;
+    }
+
+    /* Create a new object to hold the textbox properties. */
+    object_props = calloc(1, sizeof(lxw_object_properties));
+    RETURN_ON_MEM_ERROR(object_props, LXW_ERROR_MEMORY_MALLOC_FAILED);
+
+    if (user_options) {
+        object_props->x_offset = user_options->x_offset;
+        object_props->y_offset = user_options->y_offset;
+        object_props->x_scale = user_options->x_scale;
+        object_props->y_scale = user_options->y_scale;
+        object_props->object_position = user_options->object_position;
+        object_props->description = lxw_strdup(user_options->description);
+        object_props->decorative = user_options->decorative;
+
+        if (user_options->width)
+            object_props->width = user_options->width;
+        if (user_options->height)
+            object_props->height = user_options->height;
+    }
+
+    /* Copy other options or set defaults. */
+    object_props->row = row_num;
+    object_props->col = col_num;
+    object_props->text = lxw_strdup(text);
+    object_props->is_textbox = LXW_TRUE;
+
+    /* Default textbox size is 192 x 120 pixels. */
+    if (object_props->width == 0)
+        object_props->width = 192;
+
+    if (object_props->height == 0)
+        object_props->height = 120;
+
+    if (object_props->x_scale == 0.0)
+        object_props->x_scale = 1;
+
+    if (object_props->y_scale == 0.0)
+        object_props->y_scale = 1;
+
+    STAILQ_INSERT_TAIL(self->textbox_data, object_props, list_pointers);
+
+    self->has_textboxes = LXW_TRUE;
+
+    return LXW_NO_ERROR;
+}
+
+/*
+ * Insert a textbox into the worksheet.
+ */
+lxw_error
+worksheet_insert_textbox(lxw_worksheet *self,
+                         lxw_row_t row_num, lxw_col_t col_num,
+                         const char *text)
+{
+    return worksheet_insert_textbox_opt(self, row_num, col_num, text, NULL);
+}
+
 /*
  * Add a data validation to a worksheet, for a range. Ironically this requires
  * a lot of validation of the user input.
diff --git a/test/functional/src/test_autofit01.c b/test/functional/src/test_autofit01.c
new file mode 100644
index 00000000..43a45f31
--- /dev/null
+++ b/test/functional/src/test_autofit01.c
@@ -0,0 +1,25 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_autofit01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Write a single character. */
+    worksheet_write_string(worksheet, 0, 0, "A", NULL);
+
+    /* Set column width (simulating what autofit would do after user override). */
+    worksheet_set_column(worksheet, 0, 0, 1.57143, NULL);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_area01.c b/test/functional/src/test_chart_area01.c
index f9e7efc4..d7d5c77e 100644
--- a/test/functional/src/test_chart_area01.c
+++ b/test/functional/src/test_chart_area01.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_area02.c b/test/functional/src/test_chart_area02.c
index a593da04..bd4fb555 100644
--- a/test/functional/src/test_chart_area02.c
+++ b/test/functional/src/test_chart_area02.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_area03.c b/test/functional/src/test_chart_area03.c
index 1fa76dde..dcd38aa3 100644
--- a/test/functional/src/test_chart_area03.c
+++ b/test/functional/src/test_chart_area03.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_area04.c b/test/functional/src/test_chart_area04.c
new file mode 100644
index 00000000..a79ca289
--- /dev/null
+++ b/test/functional/src/test_chart_area04.c
@@ -0,0 +1,40 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_area04.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_AREA);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 63591168;
+    chart->axis_id_2 = 63592704;
+    chart->axis_id_3 = 74921856;
+    chart->axis_id_4 = 73764224;
+
+    uint8_t data1[5] = {1, 2, 3, 4, 5};
+    uint8_t data2[5] = {6, 8, 6, 4, 2};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 1);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_area05.c b/test/functional/src/test_chart_area05.c
index 4a5f63be..d94256f7 100644
--- a/test/functional/src/test_chart_area05.c
+++ b/test/functional/src/test_chart_area05.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_options chart_options = {.description = "Some alternative text"};
     worksheet_insert_chart_opt(worksheet, CELL("E9"), chart, &chart_options);
diff --git a/test/functional/src/test_chart_area06.c b/test/functional/src/test_chart_area06.c
index bffd3f8b..2fda46b0 100644
--- a/test/functional/src/test_chart_area06.c
+++ b/test/functional/src/test_chart_area06.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_options chart_options = {.description = "Some alternative text", .decorative = LXW_TRUE};
     worksheet_insert_chart_opt(worksheet, CELL("E9"), chart, &chart_options);
diff --git a/test/functional/src/test_chart_axis01.c b/test/functional/src/test_chart_axis01.c
index e4537f90..75a1b785 100644
--- a/test/functional/src/test_chart_axis01.c
+++ b/test/functional/src/test_chart_axis01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_name(chart->x_axis, "XXX");
     chart_axis_set_name(chart->y_axis, "YYY");
diff --git a/test/functional/src/test_chart_axis02.c b/test/functional/src/test_chart_axis02.c
index 2cae4ba3..1dd0fce2 100644
--- a/test/functional/src/test_chart_axis02.c
+++ b/test/functional/src/test_chart_axis02.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_name(chart->x_axis, "XXX");
     chart_axis_set_name(chart->y_axis, "YYY");
diff --git a/test/functional/src/test_chart_axis04.c b/test/functional/src/test_chart_axis04.c
index 5c3454fb..5384199e 100644
--- a/test/functional/src/test_chart_axis04.c
+++ b/test/functional/src/test_chart_axis04.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_name(chart->x_axis, "XXX");
     chart_axis_set_name(chart->y_axis, "YYY");
diff --git a/test/functional/src/test_chart_axis05.c b/test/functional/src/test_chart_axis05.c
index a29c2d6b..4fb74c37 100644
--- a/test/functional/src/test_chart_axis05.c
+++ b/test/functional/src/test_chart_axis05.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_name(chart->x_axis, "XXX");
     chart_axis_set_name(chart->y_axis, "YYY");
diff --git a/test/functional/src/test_chart_axis06.c b/test/functional/src/test_chart_axis06.c
index bffcd74d..ba31da9a 100644
--- a/test/functional/src/test_chart_axis06.c
+++ b/test/functional/src/test_chart_axis06.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     chart_title_set_name(chart, "Title");
 
diff --git a/test/functional/src/test_chart_axis07.c b/test/functional/src/test_chart_axis07.c
index cfce9d83..33fad024 100644
--- a/test/functional/src/test_chart_axis07.c
+++ b/test/functional/src/test_chart_axis07.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_name(chart->x_axis, "XXX");
     chart_axis_set_name(chart->y_axis, "YYY");
diff --git a/test/functional/src/test_chart_axis08.c b/test/functional/src/test_chart_axis08.c
index a58ac764..fbdf04a6 100644
--- a/test/functional/src/test_chart_axis08.c
+++ b/test/functional/src/test_chart_axis08.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_reverse(chart->y_axis);
 
diff --git a/test/functional/src/test_chart_axis09.c b/test/functional/src/test_chart_axis09.c
index 5af25e30..ba17b535 100644
--- a/test/functional/src/test_chart_axis09.c
+++ b/test/functional/src/test_chart_axis09.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_reverse(chart->x_axis);
 
diff --git a/test/functional/src/test_chart_axis10.c b/test/functional/src/test_chart_axis10.c
index 8d849497..7dff8ad0 100644
--- a/test/functional/src/test_chart_axis10.c
+++ b/test/functional/src/test_chart_axis10.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_reverse(chart->x_axis);
     chart_axis_set_reverse(chart->y_axis);
diff --git a/test/functional/src/test_chart_axis11.c b/test/functional/src/test_chart_axis11.c
index d43bf875..f79898b6 100644
--- a/test/functional/src/test_chart_axis11.c
+++ b/test/functional/src/test_chart_axis11.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_min(chart->x_axis, 0);
     chart_axis_set_max(chart->x_axis, 20);
diff --git a/test/functional/src/test_chart_axis12.c b/test/functional/src/test_chart_axis12.c
index cbcd72ee..9955d3bb 100644
--- a/test/functional/src/test_chart_axis12.c
+++ b/test/functional/src/test_chart_axis12.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_min(chart->y_axis, 0);
     chart_axis_set_max(chart->y_axis, 16);
diff --git a/test/functional/src/test_chart_axis13.c b/test/functional/src/test_chart_axis13.c
index d8bc1a88..39c22404 100644
--- a/test/functional/src/test_chart_axis13.c
+++ b/test/functional/src/test_chart_axis13.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_min(chart->x_axis, 0);
     chart_axis_set_max(chart->x_axis, 6);
diff --git a/test/functional/src/test_chart_axis15.c b/test/functional/src/test_chart_axis15.c
index d3d2c2c8..dd0d5064 100644
--- a/test/functional/src/test_chart_axis15.c
+++ b/test/functional/src/test_chart_axis15.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_major_unit(chart->y_axis, 2);
     chart_axis_set_minor_unit(chart->y_axis, 0.4);
diff --git a/test/functional/src/test_chart_axis17.c b/test/functional/src/test_chart_axis17.c
index 56d7a2ec..e4b63921 100644
--- a/test/functional/src/test_chart_axis17.c
+++ b/test/functional/src/test_chart_axis17.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_log_base(chart->y_axis, 10);
 
diff --git a/test/functional/src/test_chart_axis18.c b/test/functional/src/test_chart_axis18.c
index e63a10c0..b784c4b5 100644
--- a/test/functional/src/test_chart_axis18.c
+++ b/test/functional/src/test_chart_axis18.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series  = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series  = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_invert_if_negative(series);
 
diff --git a/test/functional/src/test_chart_axis19.c b/test/functional/src/test_chart_axis19.c
index 1dd0f4ec..6a393541 100644
--- a/test/functional/src/test_chart_axis19.c
+++ b/test/functional/src/test_chart_axis19.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_label_position(chart->x_axis, LXW_CHART_AXIS_LABEL_POSITION_HIGH);
     chart_axis_set_label_position(chart->y_axis, LXW_CHART_AXIS_LABEL_POSITION_LOW);
diff --git a/test/functional/src/test_chart_axis20.c b/test/functional/src/test_chart_axis20.c
index 1d3106b2..8618fe40 100644
--- a/test/functional/src/test_chart_axis20.c
+++ b/test/functional/src/test_chart_axis20.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_label_position(chart->x_axis, LXW_CHART_AXIS_LABEL_POSITION_NEXT_TO);
     chart_axis_set_label_position(chart->y_axis, LXW_CHART_AXIS_LABEL_POSITION_NONE);
diff --git a/test/functional/src/test_chart_axis21.c b/test/functional/src/test_chart_axis21.c
index 4e3b30b6..c4070ebc 100644
--- a/test/functional/src/test_chart_axis21.c
+++ b/test/functional/src/test_chart_axis21.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_reverse(chart->x_axis);
 
diff --git a/test/functional/src/test_chart_axis22.c b/test/functional/src/test_chart_axis22.c
index 5a58b0dd..311d2579 100644
--- a/test/functional/src/test_chart_axis22.c
+++ b/test/functional/src/test_chart_axis22.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_num_format(chart->x_axis, "#,##0.00");
 
diff --git a/test/functional/src/test_chart_axis23.c b/test/functional/src/test_chart_axis23.c
index 2bfc9e7b..47d14593 100644
--- a/test/functional/src/test_chart_axis23.c
+++ b/test/functional/src/test_chart_axis23.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_num_format(chart->x_axis, "dd/mm/yyyy");
     chart_axis_set_num_format(chart->y_axis, "0.00%");
diff --git a/test/functional/src/test_chart_axis24.c b/test/functional/src/test_chart_axis24.c
index aa0eaeb9..0c2580df 100644
--- a/test/functional/src/test_chart_axis24.c
+++ b/test/functional/src/test_chart_axis24.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_num_format(chart->x_axis, "dd/mm/yyyy");
     chart_axis_set_num_format(chart->y_axis, "0.00%");
diff --git a/test/functional/src/test_chart_axis25.c b/test/functional/src/test_chart_axis25.c
index 740a6072..9a3f22e7 100644
--- a/test/functional/src/test_chart_axis25.c
+++ b/test/functional/src/test_chart_axis25.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_num_format(chart->x_axis, "[$¥-411]#,##0.00");
     chart_axis_set_num_format(chart->y_axis, "0.00%");
diff --git a/test/functional/src/test_chart_axis26.c b/test/functional/src/test_chart_axis26.c
index f4ee911a..08d5707c 100644
--- a/test/functional/src/test_chart_axis26.c
+++ b/test/functional/src/test_chart_axis26.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation = 45, .baseline = -1};
     chart_axis_set_num_font(chart->x_axis, &font1);
diff --git a/test/functional/src/test_chart_axis27.c b/test/functional/src/test_chart_axis27.c
index 13441c34..9b3e03e5 100644
--- a/test/functional/src/test_chart_axis27.c
+++ b/test/functional/src/test_chart_axis27.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation = -35, .baseline = -1};
     chart_axis_set_num_font(chart->x_axis, &font1);
diff --git a/test/functional/src/test_chart_axis28.c b/test/functional/src/test_chart_axis28.c
index 0595d5ef..4f05598e 100644
--- a/test/functional/src/test_chart_axis28.c
+++ b/test/functional/src/test_chart_axis28.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation = 90, .baseline = -1};
     chart_axis_set_num_font(chart->x_axis, &font1);
diff --git a/test/functional/src/test_chart_axis29.c b/test/functional/src/test_chart_axis29.c
index 6b433743..39cc1c15 100644
--- a/test/functional/src/test_chart_axis29.c
+++ b/test/functional/src/test_chart_axis29.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation = -90, .baseline = -1};
     chart_axis_set_num_font(chart->x_axis, &font1);
diff --git a/test/functional/src/test_chart_axis30.c b/test/functional/src/test_chart_axis30.c
index c4ea8214..85d7db78 100644
--- a/test/functional/src/test_chart_axis30.c
+++ b/test/functional/src/test_chart_axis30.c
@@ -35,9 +35,9 @@ int main() {
 
     chart_axis_set_position(chart->x_axis, LXW_CHART_AXIS_POSITION_ON_TICK);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_axis31.c b/test/functional/src/test_chart_axis31.c
index c0ef40e2..66aa5f53 100644
--- a/test/functional/src/test_chart_axis31.c
+++ b/test/functional/src/test_chart_axis31.c
@@ -35,9 +35,9 @@ int main() {
 
     chart_axis_set_position(chart->y_axis, LXW_CHART_AXIS_POSITION_ON_TICK);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_axis32.c b/test/functional/src/test_chart_axis32.c
index 44937de1..c8d07a62 100644
--- a/test/functional/src/test_chart_axis32.c
+++ b/test/functional/src/test_chart_axis32.c
@@ -35,9 +35,9 @@ int main() {
 
     chart_axis_set_position(chart->x_axis, LXW_CHART_AXIS_POSITION_BETWEEN);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_axis33.c b/test/functional/src/test_chart_axis33.c
index 52daa993..691f60cb 100644
--- a/test/functional/src/test_chart_axis33.c
+++ b/test/functional/src/test_chart_axis33.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation = -45, .baseline = -1};
 
diff --git a/test/functional/src/test_chart_axis34.c b/test/functional/src/test_chart_axis34.c
index a6d36e02..8cffdcf4 100644
--- a/test/functional/src/test_chart_axis34.c
+++ b/test/functional/src/test_chart_axis34.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_interval_unit(chart->x_axis, 2);
 
diff --git a/test/functional/src/test_chart_axis35.c b/test/functional/src/test_chart_axis35.c
index d33568a0..5c2edc8f 100644
--- a/test/functional/src/test_chart_axis35.c
+++ b/test/functional/src/test_chart_axis35.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line line = {.none = LXW_TRUE};
 
diff --git a/test/functional/src/test_chart_axis36.c b/test/functional/src/test_chart_axis36.c
index b1ab2abf..28a6ef1d 100644
--- a/test/functional/src/test_chart_axis36.c
+++ b/test/functional/src/test_chart_axis36.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line line = {.none = LXW_TRUE};
 
diff --git a/test/functional/src/test_chart_axis37.c b/test/functional/src/test_chart_axis37.c
index d699a427..b0854938 100644
--- a/test/functional/src/test_chart_axis37.c
+++ b/test/functional/src/test_chart_axis37.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line line1 = {.color = LXW_COLOR_YELLOW};
     lxw_chart_line line2 = {.color = LXW_COLOR_RED};
diff --git a/test/functional/src/test_chart_axis38.c b/test/functional/src/test_chart_axis38.c
index a206663f..1051b1d5 100644
--- a/test/functional/src/test_chart_axis38.c
+++ b/test/functional/src/test_chart_axis38.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_YELLOW};
     lxw_chart_fill fill = {.color = LXW_COLOR_RED};
diff --git a/test/functional/src/test_chart_axis39.c b/test/functional/src/test_chart_axis39.c
index f1f3da21..29a34eb3 100644
--- a/test/functional/src/test_chart_axis39.c
+++ b/test/functional/src/test_chart_axis39.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.none = LXW_TRUE};
 
diff --git a/test/functional/src/test_chart_axis40.c b/test/functional/src/test_chart_axis40.c
index 79451415..e9b2fe72 100644
--- a/test/functional/src/test_chart_axis40.c
+++ b/test/functional/src/test_chart_axis40.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_interval_unit(chart->x_axis, 3);
     chart_axis_set_interval_tick(chart->x_axis, 2);
diff --git a/test/functional/src/test_chart_axis41.c b/test/functional/src/test_chart_axis41.c
index 54c86cd1..3b0eb556 100644
--- a/test/functional/src/test_chart_axis41.c
+++ b/test/functional/src/test_chart_axis41.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_major_tick_mark(chart->x_axis, LXW_CHART_AXIS_TICK_MARK_NONE);
     chart_axis_set_minor_tick_mark(chart->x_axis, LXW_CHART_AXIS_TICK_MARK_INSIDE);
diff --git a/test/functional/src/test_chart_axis42.c b/test/functional/src/test_chart_axis42.c
index 1753bc72..090c9dac 100644
--- a/test/functional/src/test_chart_axis42.c
+++ b/test/functional/src/test_chart_axis42.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_label_align(chart->x_axis, LXW_CHART_AXIS_LABEL_ALIGN_RIGHT);
 
diff --git a/test/functional/src/test_chart_axis43.c b/test/functional/src/test_chart_axis43.c
index b0ab19cb..244b7a2e 100644
--- a/test/functional/src/test_chart_axis43.c
+++ b/test/functional/src/test_chart_axis43.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_label_align(chart->x_axis, LXW_CHART_AXIS_LABEL_ALIGN_LEFT);
 
diff --git a/test/functional/src/test_chart_axis44.c b/test/functional/src/test_chart_axis44.c
index 31727b33..b9e0c3dd 100644
--- a/test/functional/src/test_chart_axis44.c
+++ b/test/functional/src/test_chart_axis44.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_name(chart->x_axis, "XXX");
     chart_axis_set_name(chart->y_axis, "YYY");
diff --git a/test/functional/src/test_chart_axis45.c b/test/functional/src/test_chart_axis45.c
index 6d14401c..b6fda5d9 100644
--- a/test/functional/src/test_chart_axis45.c
+++ b/test/functional/src/test_chart_axis45.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_name(chart->x_axis, "XXX");
     chart_axis_set_name(chart->y_axis, "YYY");
diff --git a/test/functional/src/test_chart_axis46.c b/test/functional/src/test_chart_axis46.c
index 593513ed..e419b3bb 100644
--- a/test/functional/src/test_chart_axis46.c
+++ b/test/functional/src/test_chart_axis46.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_name(chart->x_axis, "XXX");
     chart_axis_set_name(chart->y_axis, "YYY");
diff --git a/test/functional/src/test_chart_axis47.c b/test/functional/src/test_chart_axis47.c
index 3e8e0443..56bd3ee6 100644
--- a/test/functional/src/test_chart_axis47.c
+++ b/test/functional/src/test_chart_axis47.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation = 360, .baseline = -1};
 
diff --git a/test/functional/src/test_chart_axis48.c b/test/functional/src/test_chart_axis48.c
index 5093ab9f..59bd19f3 100644
--- a/test/functional/src/test_chart_axis48.c
+++ b/test/functional/src/test_chart_axis48.c
@@ -35,9 +35,9 @@ int main() {
 
     worksheet_write_string(worksheet, CELL("D1"), "Foo" , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation = 360, .baseline = -1};
 
diff --git a/test/functional/src/test_chart_bar01.c b/test/functional/src/test_chart_bar01.c
index 794376fb..5b417edf 100644
--- a/test/functional/src/test_chart_bar01.c
+++ b/test/functional/src/test_chart_bar01.c
@@ -33,8 +33,8 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_bar02.c b/test/functional/src/test_chart_bar02.c
index f2b2efb3..c8d90c7c 100644
--- a/test/functional/src/test_chart_bar02.c
+++ b/test/functional/src/test_chart_bar02.c
@@ -36,8 +36,8 @@ int main() {
 
     worksheet_write_string(worksheet1, CELL("A1"), "Foo" , NULL);
 
-    chart_add_series(chart, "Sheet2!$A$1:$A$5", "Sheet2!$B$1:$B$5");
-    chart_add_series(chart, "Sheet2!$A$1:$A$5", "Sheet2!$C$1:$C$5");
+    chart_add_series(chart, "Sheet2!$A$1:$A$5", "Sheet2!$B$1:$B$5", 0);
+    chart_add_series(chart, "Sheet2!$A$1:$A$5", "Sheet2!$C$1:$C$5", 0);
 
 
     worksheet_insert_chart(worksheet2, CELL("E9"), chart);
diff --git a/test/functional/src/test_chart_bar03.c b/test/functional/src/test_chart_bar03.c
index ac53c1cc..7c917eb5 100644
--- a/test/functional/src/test_chart_bar03.c
+++ b/test/functional/src/test_chart_bar03.c
@@ -40,24 +40,24 @@ int main() {
     chart_add_series(chart1,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart1,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart1);
 
     chart_add_series(chart2,
          "=Sheet1!$A$1:$A$4",
          "=Sheet1!$B$1:$B$4"
-    );
+    , 0);
 
     chart_add_series(chart2,
          "=Sheet1!$A$1:$A$4",
          "=Sheet1!$C$1:$C$4"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("F25"), chart2);
 
diff --git a/test/functional/src/test_chart_bar04.c b/test/functional/src/test_chart_bar04.c
index 4c328cc0..14327f2e 100644
--- a/test/functional/src/test_chart_bar04.c
+++ b/test/functional/src/test_chart_bar04.c
@@ -44,12 +44,12 @@ int main() {
     chart_add_series(chart1,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart1,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet1, CELL("E9"), chart1);
 
@@ -57,12 +57,12 @@ int main() {
     chart_add_series(chart2,
          "=Sheet2!$A$1:$A$5",
          "=Sheet2!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart2,
          "=Sheet2!$A$1:$A$5",
          "=Sheet2!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet2, CELL("E9"), chart2);
 
diff --git a/test/functional/src/test_chart_bar05.c b/test/functional/src/test_chart_bar05.c
index defc490d..ef6febe5 100644
--- a/test/functional/src/test_chart_bar05.c
+++ b/test/functional/src/test_chart_bar05.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_bar06.c b/test/functional/src/test_chart_bar06.c
index 93ff9958..629314bc 100644
--- a/test/functional/src/test_chart_bar06.c
+++ b/test/functional/src/test_chart_bar06.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_name(chart->x_axis, "Apple");
     chart_axis_set_name(chart->y_axis, "Pear");
diff --git a/test/functional/src/test_chart_bar08.c b/test/functional/src/test_chart_bar08.c
index ed6e2431..77e95eaa 100644
--- a/test/functional/src/test_chart_bar08.c
+++ b/test/functional/src/test_chart_bar08.c
@@ -37,9 +37,9 @@ int main() {
 
     worksheet_write_url(worksheet, CELL("A7"), "http://www.perl.com/" , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_bar09.c b/test/functional/src/test_chart_bar09.c
index dd5f4c1b..33831528 100644
--- a/test/functional/src/test_chart_bar09.c
+++ b/test/functional/src/test_chart_bar09.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_bar10.c b/test/functional/src/test_chart_bar10.c
index af991c4c..14c4b311 100644
--- a/test/functional/src/test_chart_bar10.c
+++ b/test/functional/src/test_chart_bar10.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_bar11.c b/test/functional/src/test_chart_bar11.c
index 17525ac0..cff5a46d 100644
--- a/test/functional/src/test_chart_bar11.c
+++ b/test/functional/src/test_chart_bar11.c
@@ -46,14 +46,14 @@ int main() {
     worksheet_write_url(worksheet, CELL("A8"), "http://www.perl.org/", NULL);
     worksheet_write_url(worksheet, CELL("A9"), "http://www.perl.net/", NULL);
 
-    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart1, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet1!$C$1:$C$5", 0);
 
-    chart_add_series(chart2, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart2, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5", 0);
 
-    chart_add_series(chart3, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart3, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart1);
     worksheet_insert_chart(worksheet, CELL("D25"), chart2);
diff --git a/test/functional/src/test_chart_bar12.c b/test/functional/src/test_chart_bar12.c
index 5bbc6087..9872f776 100644
--- a/test/functional/src/test_chart_bar12.c
+++ b/test/functional/src/test_chart_bar12.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_chart(chartsheet, chart);
 
diff --git a/test/functional/src/test_chart_bar13.c b/test/functional/src/test_chart_bar13.c
index 6e8c4515..19129148 100644
--- a/test/functional/src/test_chart_bar13.c
+++ b/test/functional/src/test_chart_bar13.c
@@ -46,13 +46,13 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet1, row, col, data[row][col], NULL);
 
-    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart1, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet1!$C$1:$C$5", 0);
 
-    chart_add_series(chart2, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart2, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart2, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart2, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_chart(chartsheet1, chart1);
     chartsheet_set_chart(chartsheet2, chart2);
diff --git a/test/functional/src/test_chart_bar14.c b/test/functional/src/test_chart_bar14.c
index baa3df72..fc4c7428 100644
--- a/test/functional/src/test_chart_bar14.c
+++ b/test/functional/src/test_chart_bar14.c
@@ -49,15 +49,15 @@ int main() {
 
     worksheet_write_url(worksheet2, CELL("A6"), "http://www.perl.com/" , NULL);
 
-    chart_add_series(chart3, NULL, "=Sheet2!$A$1:$A$5");
-    chart_add_series(chart3, NULL, "=Sheet2!$B$1:$B$5");
-    chart_add_series(chart3, NULL, "=Sheet2!$C$1:$C$5");
+    chart_add_series(chart3, NULL, "=Sheet2!$A$1:$A$5", 0);
+    chart_add_series(chart3, NULL, "=Sheet2!$B$1:$B$5", 0);
+    chart_add_series(chart3, NULL, "=Sheet2!$C$1:$C$5", 0);
 
-    chart_add_series(chart1, NULL, "=Sheet2!$A$1:$A$5");
-    chart_add_series(chart1, NULL, "=Sheet2!$B$1:$B$5");
-    chart_add_series(chart1, NULL, "=Sheet2!$C$1:$C$5");
+    chart_add_series(chart1, NULL, "=Sheet2!$A$1:$A$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet2!$B$1:$B$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet2!$C$1:$C$5", 0);
 
-    chart_add_series(chart2, NULL, "=Sheet2!$A$1:$A$5");
+    chart_add_series(chart2, NULL, "=Sheet2!$A$1:$A$5", 0);
 
     worksheet_insert_chart(worksheet2, CELL("E9"), chart1);
     worksheet_insert_chart(worksheet2, CELL("F25"), chart2);
diff --git a/test/functional/src/test_chart_bar15.c b/test/functional/src/test_chart_bar15.c
index c03f2f4e..fe569a07 100644
--- a/test/functional/src/test_chart_bar15.c
+++ b/test/functional/src/test_chart_bar15.c
@@ -42,11 +42,11 @@ int main() {
         }
     }
 
-    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart1, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet1!$C$1:$C$5", 0);
 
-    chart_add_series(chart2, NULL, "=Sheet2!$A$1:$A$5");
+    chart_add_series(chart2, NULL, "=Sheet2!$A$1:$A$5", 0);
 
     chartsheet_set_chart(chartsheet1, chart1);
     chartsheet_set_chart(chartsheet2, chart2);
diff --git a/test/functional/src/test_chart_bar16.c b/test/functional/src/test_chart_bar16.c
index 90f73fe5..82ead347 100644
--- a/test/functional/src/test_chart_bar16.c
+++ b/test/functional/src/test_chart_bar16.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_title_set_name(chart, "Title");
     chart_axis_set_name(chart->x_axis, "Apple");
diff --git a/test/functional/src/test_chart_bar17.c b/test/functional/src/test_chart_bar17.c
index 52e4ace7..93acf28d 100644
--- a/test/functional/src/test_chart_bar17.c
+++ b/test/functional/src/test_chart_bar17.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_activate(chartsheet);
 
diff --git a/test/functional/src/test_chart_bar18.c b/test/functional/src/test_chart_bar18.c
index 1a8324c7..886b2821 100644
--- a/test/functional/src/test_chart_bar18.c
+++ b/test/functional/src/test_chart_bar18.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
 
diff --git a/test/functional/src/test_chart_bar19.c b/test/functional/src/test_chart_bar19.c
index 07193160..b8e846ca 100644
--- a/test/functional/src/test_chart_bar19.c
+++ b/test/functional/src/test_chart_bar19.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL);
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL, 0);
 
     chart_series_set_values(series1, "Sheet1", 0, 0, 4, 0);
     chart_series_set_values(series2, "Sheet1", 0, 1, 4, 1);
diff --git a/test/functional/src/test_chart_bar20.c b/test/functional/src/test_chart_bar20.c
index 3066555f..d0eccd75 100644
--- a/test/functional/src/test_chart_bar20.c
+++ b/test/functional/src/test_chart_bar20.c
@@ -35,9 +35,9 @@ int main() {
 
     worksheet_write_string(worksheet, CELL("A7"), "Pear" , NULL);
 
-                                chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+                                chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_name(series2, "Apple");
     chart_series_set_name(series3, "=Sheet1!$A$7");
diff --git a/test/functional/src/test_chart_bar21.c b/test/functional/src/test_chart_bar21.c
index 581f52b4..6f2241e3 100644
--- a/test/functional/src/test_chart_bar21.c
+++ b/test/functional/src/test_chart_bar21.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_bar22.c b/test/functional/src/test_chart_bar22.c
index dcca338d..0fbd5176 100644
--- a/test/functional/src/test_chart_bar22.c
+++ b/test/functional/src/test_chart_bar22.c
@@ -50,17 +50,17 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$2:$A$5",
          "=Sheet1!$B$2:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$2:$A$5",
          "=Sheet1!$C$2:$C$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$2:$A$5",
          "=Sheet1!$D$2:$D$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_bar24.c b/test/functional/src/test_chart_bar24.c
new file mode 100644
index 00000000..e95e627a
--- /dev/null
+++ b/test/functional/src/test_chart_bar24.c
@@ -0,0 +1,40 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_bar24.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_BAR);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 63591168;
+    chart->axis_id_2 = 63592704;
+    chart->axis_id_3 = 65934464;
+    chart->axis_id_4 = 72628864;
+
+    uint8_t data1[5] = {27, 33, 44, 12, 1};
+    uint8_t data2[5] = {6, 8, 6, 4, 2};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 1);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_bar51.c b/test/functional/src/test_chart_bar51.c
index 036146ad..68a77816 100644
--- a/test/functional/src/test_chart_bar51.c
+++ b/test/functional/src/test_chart_bar51.c
@@ -31,8 +31,8 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    series1 = chart_add_series(chart, NULL, "Sheet1!$A$1:$A$5");
-    series2 = chart_add_series(chart, NULL, "Sheet1!$B$1:$B$5");
+    series1 = chart_add_series(chart, NULL, "Sheet1!$A$1:$A$5", 0);
+    series2 = chart_add_series(chart, NULL, "Sheet1!$B$1:$B$5", 0);
 
 
     /* Add the cached data for testing. */
diff --git a/test/functional/src/test_chart_bar52.c b/test/functional/src/test_chart_bar52.c
index 0b9ffd62..2246aec8 100644
--- a/test/functional/src/test_chart_bar52.c
+++ b/test/functional/src/test_chart_bar52.c
@@ -36,8 +36,8 @@ int main() {
 
     worksheet_write_string(worksheet1, CELL("A1"), "Foo" , NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, "Sheet2!$A$1:$A$5", "Sheet2!$B$1:$B$5");
-    lxw_chart_series *series2 = chart_add_series(chart, "Sheet2!$A$1:$A$5", "Sheet2!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, "Sheet2!$A$1:$A$5", "Sheet2!$B$1:$B$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, "Sheet2!$A$1:$A$5", "Sheet2!$C$1:$C$5", 0);
 
     /* Add cache data for testing. */
     lxw_chart_add_data_cache(series1->categories, data[0], 5, 3, 0);
diff --git a/test/functional/src/test_chart_bar53.c b/test/functional/src/test_chart_bar53.c
index c2dd2d9a..ebe86a6e 100644
--- a/test/functional/src/test_chart_bar53.c
+++ b/test/functional/src/test_chart_bar53.c
@@ -40,24 +40,24 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart1,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart1,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart1);
 
     lxw_chart_series *series3 = chart_add_series(chart2,
          "=Sheet1!$A$1:$A$4",
          "=Sheet1!$B$1:$B$4"
-    );
+    , 0);
 
     lxw_chart_series *series4 = chart_add_series(chart2,
          "=Sheet1!$A$1:$A$4",
          "=Sheet1!$C$1:$C$4"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("F25"), chart2);
 
diff --git a/test/functional/src/test_chart_bar54.c b/test/functional/src/test_chart_bar54.c
index 516fe2f9..ca51a38e 100644
--- a/test/functional/src/test_chart_bar54.c
+++ b/test/functional/src/test_chart_bar54.c
@@ -44,12 +44,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart1,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart1,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet1, CELL("E9"), chart1);
 
@@ -57,12 +57,12 @@ int main() {
     lxw_chart_series *series3 = chart_add_series(chart2,
          "=Sheet2!$A$1:$A$5",
          "=Sheet2!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series4 = chart_add_series(chart2,
          "=Sheet2!$A$1:$A$5",
          "=Sheet2!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet2, CELL("E9"), chart2);
 
diff --git a/test/functional/src/test_chart_bar55.c b/test/functional/src/test_chart_bar55.c
index 432e77db..1ad4932e 100644
--- a/test/functional/src/test_chart_bar55.c
+++ b/test/functional/src/test_chart_bar55.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     /* Add cache data for testing. */
     lxw_chart_add_data_cache(series1->values, data[0], 5, 3, 0);
diff --git a/test/functional/src/test_chart_bar61.c b/test/functional/src/test_chart_bar61.c
index 8c8cbc3e..68d2610c 100644
--- a/test/functional/src/test_chart_bar61.c
+++ b/test/functional/src/test_chart_bar61.c
@@ -33,8 +33,8 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL);
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL, 0);
 
 
     chart_series_set_categories(series1, "Sheet1", 0, 0, 4, 0);
diff --git a/test/functional/src/test_chart_bar65.c b/test/functional/src/test_chart_bar65.c
index f567512b..82350dbc 100644
--- a/test/functional/src/test_chart_bar65.c
+++ b/test/functional/src/test_chart_bar65.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL);
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL, 0);
 
     chart_series_set_values(series1, "Sheet1", 0, 0, 4, 0);
     chart_series_set_values(series2, "Sheet1", 0, 1, 4, 1);
diff --git a/test/functional/src/test_chart_bar69.c b/test/functional/src/test_chart_bar69.c
index 5075c5de..6a6cfd8f 100644
--- a/test/functional/src/test_chart_bar69.c
+++ b/test/functional/src/test_chart_bar69.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL);
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL, 0);
 
     chart_series_set_values(series1, "Sheet1", 0, 0, 4, 0);
     chart_series_set_values(series2, "Sheet1", 0, 1, 4, 1);
diff --git a/test/functional/src/test_chart_bar70.c b/test/functional/src/test_chart_bar70.c
index bd81591c..00d53066 100644
--- a/test/functional/src/test_chart_bar70.c
+++ b/test/functional/src/test_chart_bar70.c
@@ -35,9 +35,9 @@ int main() {
 
     worksheet_write_string(worksheet, CELL("A7"), "Pear" , NULL);
 
-                                chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+                                chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_name(series2, "Apple");
     chart_series_set_name(series3, "=Sheet1!$A$7");
diff --git a/test/functional/src/test_chart_blank01.c b/test/functional/src/test_chart_blank01.c
index f2a37ef4..aabdbca5 100644
--- a/test/functional/src/test_chart_blank01.c
+++ b/test/functional/src/test_chart_blank01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_show_blanks_as(chart, LXW_CHART_BLANKS_AS_GAP);
 
diff --git a/test/functional/src/test_chart_blank02.c b/test/functional/src/test_chart_blank02.c
index b3569586..ef10b5e9 100644
--- a/test/functional/src/test_chart_blank02.c
+++ b/test/functional/src/test_chart_blank02.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_show_blanks_as(chart, LXW_CHART_BLANKS_AS_ZERO);
 
diff --git a/test/functional/src/test_chart_blank03.c b/test/functional/src/test_chart_blank03.c
index bba7cf2d..192ffcc1 100644
--- a/test/functional/src/test_chart_blank03.c
+++ b/test/functional/src/test_chart_blank03.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_show_blanks_as(chart, LXW_CHART_BLANKS_AS_CONNECTED);
 
diff --git a/test/functional/src/test_chart_blank04.c b/test/functional/src/test_chart_blank04.c
index 32b31593..5d4bae9e 100644
--- a/test/functional/src/test_chart_blank04.c
+++ b/test/functional/src/test_chart_blank04.c
@@ -42,9 +42,9 @@ int main() {
 
 
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_show_blanks_as(chart, LXW_CHART_BLANKS_AS_CONNECTED);
 
diff --git a/test/functional/src/test_chart_blank05.c b/test/functional/src/test_chart_blank05.c
index 5473783a..b9a3409a 100644
--- a/test/functional/src/test_chart_blank05.c
+++ b/test/functional/src/test_chart_blank05.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_show_blanks_as(chart, LXW_CHART_BLANKS_AS_CONNECTED);
 
diff --git a/test/functional/src/test_chart_blank06.c b/test/functional/src/test_chart_blank06.c
index 471be039..8bab58ca 100644
--- a/test/functional/src/test_chart_blank06.c
+++ b/test/functional/src/test_chart_blank06.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_show_hidden_data(chart);
 
diff --git a/test/functional/src/test_chart_chartarea01.c b/test/functional/src/test_chart_chartarea01.c
index 5d637ee6..542c9190 100644
--- a/test/functional/src/test_chart_chartarea01.c
+++ b/test/functional/src/test_chart_chartarea01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
     lxw_chart_line line1 = {.none  = LXW_TRUE};
diff --git a/test/functional/src/test_chart_chartarea03.c b/test/functional/src/test_chart_chartarea03.c
index afaa8c7a..a2a532d4 100644
--- a/test/functional/src/test_chart_chartarea03.c
+++ b/test/functional/src/test_chart_chartarea03.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     lxw_chart_line line1 = {.dash_type = LXW_CHART_LINE_DASH_ROUND_DOT};
diff --git a/test/functional/src/test_chart_chartarea05.c b/test/functional/src/test_chart_chartarea05.c
index 7a693f88..457bfdca 100644
--- a/test/functional/src/test_chart_chartarea05.c
+++ b/test/functional/src/test_chart_chartarea05.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
 
     lxw_chart_line line1 = {.dash_type = LXW_CHART_LINE_DASH_LONG_DASH, .color = 0xFFFF00};
diff --git a/test/functional/src/test_chart_chartarea06.c b/test/functional/src/test_chart_chartarea06.c
index 4857f81c..7409a305 100644
--- a/test/functional/src/test_chart_chartarea06.c
+++ b/test/functional/src/test_chart_chartarea06.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
 
     lxw_chart_line line1 = {.dash_type = LXW_CHART_LINE_DASH_LONG_DASH, .color = 0xFFFF00};
diff --git a/test/functional/src/test_chart_clustered01.c b/test/functional/src/test_chart_clustered01.c
new file mode 100644
index 00000000..ae1691d6
--- /dev/null
+++ b/test/functional/src/test_chart_clustered01.c
@@ -0,0 +1,78 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_clustered01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 45886080;
+    chart->axis_id_2 = 45928832;
+
+    /* Write the worksheet data. */
+    worksheet_write_string(worksheet, 0, 0, "Types",      NULL);
+    worksheet_write_string(worksheet, 0, 1, "Sub Type",   NULL);
+    worksheet_write_string(worksheet, 0, 2, "Value 1",    NULL);
+    worksheet_write_string(worksheet, 0, 3, "Value 2",    NULL);
+    worksheet_write_string(worksheet, 0, 4, "Value 3",    NULL);
+
+    worksheet_write_string(worksheet, 1, 0, "Type 1",     NULL);
+    worksheet_write_string(worksheet, 1, 1, "Sub Type A", NULL);
+    worksheet_write_number(worksheet, 1, 2, 5000,         NULL);
+    worksheet_write_number(worksheet, 1, 3, 8000,         NULL);
+    worksheet_write_number(worksheet, 1, 4, 6000,         NULL);
+
+    worksheet_write_string(worksheet, 2, 0, "",           NULL);
+    worksheet_write_string(worksheet, 2, 1, "Sub Type B", NULL);
+    worksheet_write_number(worksheet, 2, 2, 2000,         NULL);
+    worksheet_write_number(worksheet, 2, 3, 3000,         NULL);
+    worksheet_write_number(worksheet, 2, 4, 4000,         NULL);
+
+    worksheet_write_string(worksheet, 3, 0, "",           NULL);
+    worksheet_write_string(worksheet, 3, 1, "Sub Type C", NULL);
+    worksheet_write_number(worksheet, 3, 2, 250,          NULL);
+    worksheet_write_number(worksheet, 3, 3, 1000,         NULL);
+    worksheet_write_number(worksheet, 3, 4, 2000,         NULL);
+
+    worksheet_write_string(worksheet, 4, 0, "Type 2",     NULL);
+    worksheet_write_string(worksheet, 4, 1, "Sub Type D", NULL);
+    worksheet_write_number(worksheet, 4, 2, 6000,         NULL);
+    worksheet_write_number(worksheet, 4, 3, 6000,         NULL);
+    worksheet_write_number(worksheet, 4, 4, 6500,         NULL);
+
+    worksheet_write_string(worksheet, 5, 0, "",           NULL);
+    worksheet_write_string(worksheet, 5, 1, "Sub Type E", NULL);
+    worksheet_write_number(worksheet, 5, 2, 500,          NULL);
+    worksheet_write_number(worksheet, 5, 3, 300,          NULL);
+    worksheet_write_number(worksheet, 5, 4, 200,          NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart,
+                                                  "=Sheet1!$A$2:$B$6",
+                                                  "=Sheet1!$C$2:$C$6");
+    chart_series_set_name(series1, "=Sheet1!$C$1");
+
+    lxw_chart_series *series2 = chart_add_series(chart,
+                                                  "=Sheet1!$A$2:$B$6",
+                                                  "=Sheet1!$D$2:$D$6");
+    chart_series_set_name(series2, "=Sheet1!$D$1");
+
+    lxw_chart_series *series3 = chart_add_series(chart,
+                                                  "=Sheet1!$A$2:$B$6",
+                                                  "=Sheet1!$E$2:$E$6");
+    chart_series_set_name(series3, "=Sheet1!$E$1");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_column01.c b/test/functional/src/test_chart_column01.c
index 6b2e46a6..29f2fdc9 100644
--- a/test/functional/src/test_chart_column01.c
+++ b/test/functional/src/test_chart_column01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column02.c b/test/functional/src/test_chart_column02.c
index 2ea1b557..90ed7a1b 100644
--- a/test/functional/src/test_chart_column02.c
+++ b/test/functional/src/test_chart_column02.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column03.c b/test/functional/src/test_chart_column03.c
index 0fd467df..284a8120 100644
--- a/test/functional/src/test_chart_column03.c
+++ b/test/functional/src/test_chart_column03.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column04.c b/test/functional/src/test_chart_column04.c
new file mode 100644
index 00000000..cc4c50fb
--- /dev/null
+++ b/test/functional/src/test_chart_column04.c
@@ -0,0 +1,40 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_column04.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 63591936;
+    chart->axis_id_2 = 63593856;
+    chart->axis_id_3 = 63613568;
+    chart->axis_id_4 = 63612032;
+
+    uint8_t data1[5] = {1, 2, 3, 4, 5};
+    uint8_t data2[5] = {6, 8, 6, 4, 2};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 1);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_column05.c b/test/functional/src/test_chart_column05.c
index 1fcedd7a..8049e203 100644
--- a/test/functional/src/test_chart_column05.c
+++ b/test/functional/src/test_chart_column05.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, NULL, "=Foo!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Foo!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Foo!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Foo!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Foo!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Foo!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column06.c b/test/functional/src/test_chart_column06.c
index 8e26e6f9..ee259731 100644
--- a/test/functional/src/test_chart_column06.c
+++ b/test/functional/src/test_chart_column06.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet1, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet2, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column07.c b/test/functional/src/test_chart_column07.c
index 3431d807..99de5c21 100644
--- a/test/functional/src/test_chart_column07.c
+++ b/test/functional/src/test_chart_column07.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=(Sheet1!$A$1:$A$2,Sheet1!$A$4:$A$5)");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=(Sheet1!$A$1:$A$2,Sheet1!$A$4:$A$5)", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column08.c b/test/functional/src/test_chart_column08.c
index 660251f0..d9fa81dd 100644
--- a/test/functional/src/test_chart_column08.c
+++ b/test/functional/src/test_chart_column08.c
@@ -35,7 +35,7 @@ int main() {
 
     lxw_chart_series *series1 = chart_add_series(chart,
                                                  "=(Sheet1!$A$1:$A$2,Sheet1!$A$4:$A$5)",
-                                                 "=(Sheet1!$B$1:$B$2,Sheet1!$B$4:$B$5)");
+                                                 "=(Sheet1!$B$1:$B$2,Sheet1!$B$4:$B$5)", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column09.c b/test/functional/src/test_chart_column09.c
index aecece0d..80101f2c 100644
--- a/test/functional/src/test_chart_column09.c
+++ b/test/functional/src/test_chart_column09.c
@@ -35,7 +35,7 @@ int main() {
 
     chart_add_series(chart,
                      "=Sheet1!$A$1:$A$5",
-                     "=Sheet1!$B$1:$B$5");
+                     "=Sheet1!$B$1:$B$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column10.c b/test/functional/src/test_chart_column10.c
index a46b3a8d..b5c2865d 100644
--- a/test/functional/src/test_chart_column10.c
+++ b/test/functional/src/test_chart_column10.c
@@ -32,7 +32,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_column11.c b/test/functional/src/test_chart_column11.c
index 9d90c55f..ddb7c110 100644
--- a/test/functional/src/test_chart_column11.c
+++ b/test/functional/src/test_chart_column11.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_set_style(chart, 1);
 
diff --git a/test/functional/src/test_chart_column12.c b/test/functional/src/test_chart_column12.c
index d8ed3956..38dc0903 100644
--- a/test/functional/src/test_chart_column12.c
+++ b/test/functional/src/test_chart_column12.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_set_style(chart, 48);
 
diff --git a/test/functional/src/test_chart_column13.c b/test/functional/src/test_chart_column13.c
index 1374e3c0..7fa2075e 100644
--- a/test/functional/src/test_chart_column13.c
+++ b/test/functional/src/test_chart_column13.c
@@ -25,7 +25,7 @@ int main() {
     worksheet_write_number(worksheet, CELL("A2"), 1,       NULL);
     worksheet_write_number(worksheet, CELL("B2"), 2,       NULL);
 
-    chart_add_series(chart, "=Sheet1!$A$1:$B$1", "=Sheet1!$A$2:$B$2");
+    chart_add_series(chart, "=Sheet1!$A$1:$B$1", "=Sheet1!$A$2:$B$2", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_combined01.c b/test/functional/src/test_chart_combined01.c
new file mode 100644
index 00000000..b6259986
--- /dev/null
+++ b/test/functional/src/test_chart_combined01.c
@@ -0,0 +1,38 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart1->axis_id_1 = 84882560;
+    chart1->axis_id_2 = 84884096;
+
+    uint8_t data1[5] = {2, 7, 3, 6, 2};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined02.c b/test/functional/src/test_chart_combined02.c
new file mode 100644
index 00000000..2e85dd17
--- /dev/null
+++ b/test/functional/src/test_chart_combined02.c
@@ -0,0 +1,41 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined02.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+    lxw_chart     *chart2    = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart1->axis_id_1 = 50010001;
+    chart1->axis_id_2 = 50010002;
+
+    uint8_t data1[5] = {2, 7, 3, 6, 2};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5", 0);
+
+    chart_combine(chart1, chart2);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined03.c b/test/functional/src/test_chart_combined03.c
new file mode 100644
index 00000000..b0b9eb31
--- /dev/null
+++ b/test/functional/src/test_chart_combined03.c
@@ -0,0 +1,41 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined03.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+    lxw_chart     *chart2    = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    uint8_t data1[5] = {2, 7, 3, 6, 2};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+    uint8_t data3[5] = {4, 2, 5, 2, 1};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+        worksheet_write_number(worksheet, row, 2, data3[row], NULL);
+    }
+
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5");
+
+    chart_add_series(chart2, NULL, "=Sheet1!$C$1:$C$5");
+
+    chart_combine(chart1, chart2);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined04.c b/test/functional/src/test_chart_combined04.c
new file mode 100644
index 00000000..59f8d466
--- /dev/null
+++ b/test/functional/src/test_chart_combined04.c
@@ -0,0 +1,50 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined04.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+    lxw_chart     *chart2    = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart1->axis_id_1 = 50010001;
+    chart1->axis_id_2 = 50010002;
+    chart1->axis_id_3 = 60010001;
+    chart1->axis_id_4 = 60010002;
+
+    uint8_t data1[5] = {2, 7, 3, 6, 2};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    /* Primary chart series on primary axis. */
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5", 0);
+
+    /* Combined chart series - use y2_axis=0 because is_secondary will
+     * make the chart inherit the primary chart's secondary axis IDs. */
+    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5", 0);
+
+    /* Mark chart2 as secondary (uses chart1's secondary axis IDs). */
+    chart2->is_secondary = LXW_TRUE;
+
+    chart_combine(chart1, chart2);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined05.c b/test/functional/src/test_chart_combined05.c
new file mode 100644
index 00000000..4e657eee
--- /dev/null
+++ b/test/functional/src/test_chart_combined05.c
@@ -0,0 +1,47 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined05.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_BAR);
+    lxw_chart     *chart2    = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart1->axis_id_1 = 60914304;
+    chart1->axis_id_2 = 78899072;
+    chart1->axis_id_3 = 85542016;
+    chart1->axis_id_4 = 85183872;
+
+    uint8_t data1[5] = {2, 7, 3, 6, 2};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
+
+    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5", 0);
+
+    /* Mark chart2 as secondary (uses chart1's secondary axis IDs). */
+    chart2->is_secondary = LXW_TRUE;
+
+    chart_combine(chart1, chart2);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined06.c b/test/functional/src/test_chart_combined06.c
new file mode 100644
index 00000000..3e672337
--- /dev/null
+++ b/test/functional/src/test_chart_combined06.c
@@ -0,0 +1,44 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined06.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_AREA);
+    lxw_chart     *chart2    = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart1->axis_id_1 = 91755648;
+    chart1->axis_id_2 = 91757952;
+
+    uint8_t data1[5] = {2, 7, 3, 6, 2};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5");
+
+    chart_combine(chart1, chart2);
+
+    /* Set cross_between to "between" for area chart. */
+    chart_axis_set_position(chart1->x_axis, LXW_CHART_AXIS_POSITION_BETWEEN);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined07.c b/test/functional/src/test_chart_combined07.c
new file mode 100644
index 00000000..8817f837
--- /dev/null
+++ b/test/functional/src/test_chart_combined07.c
@@ -0,0 +1,44 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined07.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+    lxw_chart     *chart2    = workbook_add_chart(workbook, LXW_CHART_SCATTER);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart1->axis_id_1 = 81267328;
+    chart1->axis_id_2 = 81297792;
+
+    uint8_t data1[5] = {2, 3, 4, 5, 6};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+    uint8_t data3[5] = {5, 10, 15, 10, 5};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+        worksheet_write_number(worksheet, row, 2, data3[row], NULL);
+    }
+
+    chart_add_series(chart1, "=Sheet1!$A$1:$A$5", "=Sheet1!$B$1:$B$5");
+
+    chart_add_series(chart2, "=Sheet1!$A$1:$A$5", "=Sheet1!$C$1:$C$5");
+
+    chart_combine(chart1, chart2);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined08.c b/test/functional/src/test_chart_combined08.c
new file mode 100644
index 00000000..b8593528
--- /dev/null
+++ b/test/functional/src/test_chart_combined08.c
@@ -0,0 +1,49 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined08.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+    lxw_chart     *chart2    = workbook_add_chart(workbook, LXW_CHART_SCATTER);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart1->axis_id_1 = 81267328;
+    chart1->axis_id_2 = 81297792;
+    chart1->axis_id_3 = 89510656;
+    chart1->axis_id_4 = 84556032;
+
+    uint8_t data1[5] = {2, 3, 4, 5, 6};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+    uint8_t data3[5] = {5, 10, 15, 10, 5};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+        worksheet_write_number(worksheet, row, 2, data3[row], NULL);
+    }
+
+    chart_add_series(chart1, "=Sheet1!$A$1:$A$5", "=Sheet1!$B$1:$B$5");
+
+    chart_add_series(chart2, "=Sheet1!$A$1:$A$5", "=Sheet1!$C$1:$C$5", 0);
+
+    /* Mark chart2 as secondary (uses chart1's secondary axis IDs). */
+    chart2->is_secondary = LXW_TRUE;
+
+    chart_combine(chart1, chart2);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined09.c b/test/functional/src/test_chart_combined09.c
new file mode 100644
index 00000000..4e6d421c
--- /dev/null
+++ b/test/functional/src/test_chart_combined09.c
@@ -0,0 +1,53 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_combined09.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart1    = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+    lxw_chart     *chart2    = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart1->axis_id_1 = 114984064;
+    chart1->axis_id_2 = 114985600;
+    chart1->axis_id_3 = 114988928;
+    chart1->axis_id_4 = 114987392;
+
+    uint8_t data1[5] = {2, 7, 3, 6, 2};
+    uint8_t data2[5] = {20, 25, 10, 10, 20};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
+
+    chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5", 0);
+
+    /* Mark chart2 as secondary (uses chart1's secondary axis IDs). */
+    chart2->is_secondary = LXW_TRUE;
+
+    /* Set font properties on primary and secondary Y axes. */
+    lxw_chart_font font = {.bold = LXW_TRUE, .baseline = -1};
+
+    chart_axis_set_num_font(chart1->y_axis, &font);
+    chart_axis_set_num_font(chart1->y2_axis, &font);
+
+    chart_combine(chart1, chart2);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart1);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined10.c b/test/functional/src/test_chart_combined10.c
new file mode 100644
index 00000000..0e9d6fa9
--- /dev/null
+++ b/test/functional/src/test_chart_combined10.c
@@ -0,0 +1,44 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook       = workbook_new("test_chart_combined10.xlsx");
+    lxw_worksheet *worksheet      = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart_doughnut = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT);
+    lxw_chart     *chart_pie      = workbook_add_chart(workbook, LXW_CHART_PIE);
+
+    /* Write data for the doughnut chart. */
+    worksheet_write_string(worksheet, 1, 7, "Donut", NULL);
+    worksheet_write_number(worksheet, 2, 7, 25, NULL);
+    worksheet_write_number(worksheet, 3, 7, 50, NULL);
+    worksheet_write_number(worksheet, 4, 7, 25, NULL);
+    worksheet_write_number(worksheet, 5, 7, 100, NULL);
+
+    /* Write data for the pie chart. */
+    worksheet_write_string(worksheet, 1, 8, "Pie", NULL);
+    worksheet_write_number(worksheet, 2, 8, 75, NULL);
+    worksheet_write_number(worksheet, 3, 8, 1, NULL);
+    worksheet_write_number(worksheet, 4, 8, 124, NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart_doughnut, NULL, "=Sheet1!$H$3:$H$6");
+    chart_series_set_name(series1, "=Sheet1!$H$2");
+
+    lxw_chart_series *series2 = chart_add_series(chart_pie, NULL, "=Sheet1!$I$3:$I$6");
+    chart_series_set_name(series2, "=Sheet1!$I$2");
+
+    chart_combine(chart_doughnut, chart_pie);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart_doughnut);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_combined11.c b/test/functional/src/test_chart_combined11.c
new file mode 100644
index 00000000..b160116e
--- /dev/null
+++ b/test/functional/src/test_chart_combined11.c
@@ -0,0 +1,76 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook       = workbook_new("test_chart_combined11.xlsx");
+    lxw_worksheet *worksheet      = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart_doughnut = workbook_add_chart(workbook, LXW_CHART_DOUGHNUT);
+    lxw_chart     *chart_pie      = workbook_add_chart(workbook, LXW_CHART_PIE);
+
+    /* Write data for the doughnut chart. */
+    worksheet_write_string(worksheet, 1, 7, "Donut", NULL);
+    worksheet_write_number(worksheet, 2, 7, 25, NULL);
+    worksheet_write_number(worksheet, 3, 7, 50, NULL);
+    worksheet_write_number(worksheet, 4, 7, 25, NULL);
+    worksheet_write_number(worksheet, 5, 7, 100, NULL);
+
+    /* Write data for the pie chart. */
+    worksheet_write_string(worksheet, 1, 8, "Pie", NULL);
+    worksheet_write_number(worksheet, 2, 8, 75, NULL);
+    worksheet_write_number(worksheet, 3, 8, 1, NULL);
+    worksheet_write_number(worksheet, 4, 8, 124, NULL);
+
+    /* Set up point formatting for doughnut chart. */
+    lxw_chart_fill fill_red    = {.color = 0xFF0000};
+    lxw_chart_fill fill_yellow = {.color = 0xFFC000};
+    lxw_chart_fill fill_green  = {.color = 0x00B050};
+    lxw_chart_fill fill_none   = {.none = LXW_TRUE};
+
+    lxw_chart_point point1_1 = {.fill = &fill_red};
+    lxw_chart_point point1_2 = {.fill = &fill_yellow};
+    lxw_chart_point point1_3 = {.fill = &fill_green};
+    lxw_chart_point point1_4 = {.fill = &fill_none};
+
+    lxw_chart_point *points1[] = {&point1_1, &point1_2, &point1_3, &point1_4, NULL};
+
+    lxw_chart_series *series1 = chart_add_series(chart_doughnut, NULL, "=Sheet1!$H$3:$H$6");
+    chart_series_set_name(series1, "=Sheet1!$H$2");
+    chart_series_set_points(series1, points1);
+
+    chart_set_rotation(chart_doughnut, 270);
+    chart_legend_set_position(chart_doughnut, LXW_CHART_LEGEND_NONE);
+
+    /* Set chart area to have no border and no fill. */
+    lxw_chart_line line_none = {.none = LXW_TRUE};
+    chart_chartarea_set_line(chart_doughnut, &line_none);
+    chart_chartarea_set_fill(chart_doughnut, &fill_none);
+
+    /* Set up point formatting for pie chart. */
+    lxw_chart_point point2_1 = {.fill = &fill_none};
+    lxw_chart_point point2_2 = {.fill = &fill_red};
+    lxw_chart_point point2_3 = {.fill = &fill_none};
+
+    lxw_chart_point *points2[] = {&point2_1, &point2_2, &point2_3, NULL};
+
+    lxw_chart_series *series2 = chart_add_series(chart_pie, NULL, "=Sheet1!$I$3:$I$6");
+    chart_series_set_name(series2, "=Sheet1!$I$2");
+    chart_series_set_points(series2, points2);
+
+    chart_set_rotation(chart_pie, 270);
+
+    chart_combine(chart_doughnut, chart_pie);
+
+    worksheet_insert_chart(worksheet, CELL("A1"), chart_doughnut);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_crossing01.c b/test/functional/src/test_chart_crossing01.c
index c00f5b91..c5842209 100644
--- a/test/functional/src/test_chart_crossing01.c
+++ b/test/functional/src/test_chart_crossing01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_crossing_max(chart->y_axis);
 
diff --git a/test/functional/src/test_chart_crossing02.c b/test/functional/src/test_chart_crossing02.c
index a7d1ac6d..ef74749d 100644
--- a/test/functional/src/test_chart_crossing02.c
+++ b/test/functional/src/test_chart_crossing02.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_crossing(chart->x_axis, 3);
     chart_axis_set_crossing(chart->y_axis, 8);
diff --git a/test/functional/src/test_chart_crossing03.c b/test/functional/src/test_chart_crossing03.c
index 8b092552..613b53a3 100644
--- a/test/functional/src/test_chart_crossing03.c
+++ b/test/functional/src/test_chart_crossing03.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_crossing_max(chart->x_axis);
     chart_axis_set_crossing_max(chart->y_axis);
diff --git a/test/functional/src/test_chart_crossing04.c b/test/functional/src/test_chart_crossing04.c
index f3b8f323..5f34e945 100644
--- a/test/functional/src/test_chart_crossing04.c
+++ b/test/functional/src/test_chart_crossing04.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_crossing(chart->x_axis, 3);
     chart_axis_set_crossing(chart->y_axis, 8);
diff --git a/test/functional/src/test_chart_crossing05.c b/test/functional/src/test_chart_crossing05.c
index 372c6040..10d909be 100644
--- a/test/functional/src/test_chart_crossing05.c
+++ b/test/functional/src/test_chart_crossing05.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_crossing_min(chart->x_axis);
 
diff --git a/test/functional/src/test_chart_crossing06.c b/test/functional/src/test_chart_crossing06.c
index 42605988..1b9a5ed7 100644
--- a/test/functional/src/test_chart_crossing06.c
+++ b/test/functional/src/test_chart_crossing06.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_set_crossing_min(chart->y_axis);
 
diff --git a/test/functional/src/test_chart_data_labels01.c b/test/functional/src/test_chart_data_labels01.c
index 36fb5eb9..eb2d1c79 100644
--- a/test/functional/src/test_chart_data_labels01.c
+++ b/test/functional/src/test_chart_data_labels01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels02.c b/test/functional/src/test_chart_data_labels02.c
index eb871587..55bc02e8 100644
--- a/test/functional/src/test_chart_data_labels02.c
+++ b/test/functional/src/test_chart_data_labels02.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels03.c b/test/functional/src/test_chart_data_labels03.c
index e65c1c94..6c7dd1ef 100644
--- a/test/functional/src/test_chart_data_labels03.c
+++ b/test/functional/src/test_chart_data_labels03.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels04.c b/test/functional/src/test_chart_data_labels04.c
index 7a53517a..682a5796 100644
--- a/test/functional/src/test_chart_data_labels04.c
+++ b/test/functional/src/test_chart_data_labels04.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels05.c b/test/functional/src/test_chart_data_labels05.c
index 3b989295..a97801c2 100644
--- a/test/functional/src/test_chart_data_labels05.c
+++ b/test/functional/src/test_chart_data_labels05.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels06.c b/test/functional/src/test_chart_data_labels06.c
index f37292ae..67b1b1ea 100644
--- a/test/functional/src/test_chart_data_labels06.c
+++ b/test/functional/src/test_chart_data_labels06.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels07.c b/test/functional/src/test_chart_data_labels07.c
index 83d661f9..e49825f9 100644
--- a/test/functional/src/test_chart_data_labels07.c
+++ b/test/functional/src/test_chart_data_labels07.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_position(series1, LXW_CHART_LABEL_POSITION_CENTER);
diff --git a/test/functional/src/test_chart_data_labels08.c b/test/functional/src/test_chart_data_labels08.c
index cd32ffcb..04fbf68d 100644
--- a/test/functional/src/test_chart_data_labels08.c
+++ b/test/functional/src/test_chart_data_labels08.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_position(series1, LXW_CHART_LABEL_POSITION_RIGHT);
diff --git a/test/functional/src/test_chart_data_labels09.c b/test/functional/src/test_chart_data_labels09.c
index 63160b4f..e1f3cc32 100644
--- a/test/functional/src/test_chart_data_labels09.c
+++ b/test/functional/src/test_chart_data_labels09.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels10.c b/test/functional/src/test_chart_data_labels10.c
index 2daedf99..e473856a 100644
--- a/test/functional/src/test_chart_data_labels10.c
+++ b/test/functional/src/test_chart_data_labels10.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels11.c b/test/functional/src/test_chart_data_labels11.c
index 38da5678..605b6e99 100644
--- a/test/functional/src/test_chart_data_labels11.c
+++ b/test/functional/src/test_chart_data_labels11.c
@@ -29,7 +29,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_position(series1, LXW_CHART_LABEL_POSITION_BEST_FIT);
diff --git a/test/functional/src/test_chart_data_labels12.c b/test/functional/src/test_chart_data_labels12.c
index 7c567de2..23123619 100644
--- a/test/functional/src/test_chart_data_labels12.c
+++ b/test/functional/src/test_chart_data_labels12.c
@@ -29,7 +29,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_position(series1, LXW_CHART_LABEL_POSITION_OUTSIDE_END);
diff --git a/test/functional/src/test_chart_data_labels13.c b/test/functional/src/test_chart_data_labels13.c
index 6c2c255e..21dd1857 100644
--- a/test/functional/src/test_chart_data_labels13.c
+++ b/test/functional/src/test_chart_data_labels13.c
@@ -29,7 +29,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_position(series1, LXW_CHART_LABEL_POSITION_INSIDE_END);
diff --git a/test/functional/src/test_chart_data_labels14.c b/test/functional/src/test_chart_data_labels14.c
index 8fa903c4..f390db91 100644
--- a/test/functional/src/test_chart_data_labels14.c
+++ b/test/functional/src/test_chart_data_labels14.c
@@ -29,7 +29,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_position(series1, LXW_CHART_LABEL_POSITION_CENTER);
diff --git a/test/functional/src/test_chart_data_labels15.c b/test/functional/src/test_chart_data_labels15.c
index 09ddfff5..d42bb47b 100644
--- a/test/functional/src/test_chart_data_labels15.c
+++ b/test/functional/src/test_chart_data_labels15.c
@@ -29,7 +29,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_position(series1, LXW_CHART_LABEL_POSITION_BEST_FIT);
diff --git a/test/functional/src/test_chart_data_labels16.c b/test/functional/src/test_chart_data_labels16.c
index 64482fcc..3274aac4 100644
--- a/test/functional/src/test_chart_data_labels16.c
+++ b/test/functional/src/test_chart_data_labels16.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_position(series1, LXW_CHART_LABEL_POSITION_CENTER);
diff --git a/test/functional/src/test_chart_data_labels18.c b/test/functional/src/test_chart_data_labels18.c
index ec747976..a16b9284 100644
--- a/test/functional/src/test_chart_data_labels18.c
+++ b/test/functional/src/test_chart_data_labels18.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels19.c b/test/functional/src/test_chart_data_labels19.c
index 10e6d673..fa540d60 100644
--- a/test/functional/src/test_chart_data_labels19.c
+++ b/test/functional/src/test_chart_data_labels19.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels20.c b/test/functional/src/test_chart_data_labels20.c
index df7bbda8..d9d3cc22 100644
--- a/test/functional/src/test_chart_data_labels20.c
+++ b/test/functional/src/test_chart_data_labels20.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels_legend(series1);
diff --git a/test/functional/src/test_chart_data_labels21.c b/test/functional/src/test_chart_data_labels21.c
index 862b8514..93cb751c 100644
--- a/test/functional/src/test_chart_data_labels21.c
+++ b/test/functional/src/test_chart_data_labels21.c
@@ -30,7 +30,7 @@ int main() {
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_font font = {.name = "Consolas", .pitch_family = 49, .charset = 0, .baseline = -1};
 
diff --git a/test/functional/src/test_chart_data_labels22.c b/test/functional/src/test_chart_data_labels22.c
index 7cce9726..ed064c62 100644
--- a/test/functional/src/test_chart_data_labels22.c
+++ b/test/functional/src/test_chart_data_labels22.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels23.c b/test/functional/src/test_chart_data_labels23.c
index 7b9fb5f0..7f576acf 100644
--- a/test/functional/src/test_chart_data_labels23.c
+++ b/test/functional/src/test_chart_data_labels23.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font = {.name = "Consolas", .pitch_family = 49, .charset = 0, .baseline = -1};
 
diff --git a/test/functional/src/test_chart_data_labels24.c b/test/functional/src/test_chart_data_labels24.c
index 9c8ca2d4..7aadf744 100644
--- a/test/functional/src/test_chart_data_labels24.c
+++ b/test/functional/src/test_chart_data_labels24.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font = {.name = "Consolas", .size = 12, .pitch_family = 49, .charset = 0, .baseline = -1};
 
diff --git a/test/functional/src/test_chart_data_labels25.c b/test/functional/src/test_chart_data_labels25.c
index f32cffd0..0dfc043f 100644
--- a/test/functional/src/test_chart_data_labels25.c
+++ b/test/functional/src/test_chart_data_labels25.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation =  45, .baseline = -1};
     lxw_chart_font font2 = {.rotation = -45, .baseline = -1};
diff --git a/test/functional/src/test_chart_data_labels26.c b/test/functional/src/test_chart_data_labels26.c
index ca3e0847..59baa594 100644
--- a/test/functional/src/test_chart_data_labels26.c
+++ b/test/functional/src/test_chart_data_labels26.c
@@ -33,15 +33,15 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_data_label data_label1 = {.value = "33"};
     lxw_chart_data_label *data_labels[] = {&data_label1, NULL};
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels27.c b/test/functional/src/test_chart_data_labels27.c
index 34533605..48260de7 100644
--- a/test/functional/src/test_chart_data_labels27.c
+++ b/test/functional/src/test_chart_data_labels27.c
@@ -33,15 +33,15 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_data_label data_label1 = {.value = "=Sheet1!$D$1"};
     lxw_chart_data_label *data_labels[] = {&data_label1, NULL};
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels28.c b/test/functional/src/test_chart_data_labels28.c
index 07637c55..f7e2b9ac 100644
--- a/test/functional/src/test_chart_data_labels28.c
+++ b/test/functional/src/test_chart_data_labels28.c
@@ -36,7 +36,7 @@ int main() {
     worksheet_write_string(worksheet, CELL("D1"), "foo" , NULL);
     worksheet_write_string(worksheet, CELL("D2"), "bar" , NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
 
     lxw_chart_data_label data_label1 = {.value = "123"};
@@ -56,8 +56,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels29.c b/test/functional/src/test_chart_data_labels29.c
index a71df0be..7a18a4ab 100644
--- a/test/functional/src/test_chart_data_labels29.c
+++ b/test/functional/src/test_chart_data_labels29.c
@@ -34,15 +34,15 @@ int main() {
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_data_label data_label1 = {.hide = LXW_TRUE};
     lxw_chart_data_label *data_labels[] = {&data_label1, NULL};
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels30.c b/test/functional/src/test_chart_data_labels30.c
index 19f79359..e3625fee 100644
--- a/test/functional/src/test_chart_data_labels30.c
+++ b/test/functional/src/test_chart_data_labels30.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_data_label data_label1 = {.hide = LXW_TRUE};
     lxw_chart_data_label data_label2 = {0};
@@ -41,8 +41,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels31.c b/test/functional/src/test_chart_data_labels31.c
index c7ad8d0f..638db817 100644
--- a/test/functional/src/test_chart_data_labels31.c
+++ b/test/functional/src/test_chart_data_labels31.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_data_label data_label1 = {.value = "33"};
     lxw_chart_data_label *data_labels[] = {&data_label1, NULL};
@@ -41,8 +41,8 @@ int main() {
     chart_series_set_labels_custom(series, data_labels);
     chart_series_set_labels_options(series, LXW_TRUE, LXW_TRUE, LXW_TRUE);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels32.c b/test/functional/src/test_chart_data_labels32.c
index cc2bf31f..2ef5e74a 100644
--- a/test/functional/src/test_chart_data_labels32.c
+++ b/test/functional/src/test_chart_data_labels32.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_font font1 = {.bold = LXW_TRUE, .italic = LXW_TRUE, .color = LXW_COLOR_RED, .baseline = -1};
     lxw_chart_data_label data_label1 = {.value = "33", .font = &font1};
@@ -41,8 +41,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels33.c b/test/functional/src/test_chart_data_labels33.c
index dae0c953..31fe7bdb 100644
--- a/test/functional/src/test_chart_data_labels33.c
+++ b/test/functional/src/test_chart_data_labels33.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_font font1 = {.bold = LXW_TRUE, .italic = LXW_TRUE, .baseline = -1};
     lxw_chart_data_label data_label1 = {.font = &font1};
@@ -41,8 +41,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels34.c b/test/functional/src/test_chart_data_labels34.c
index 132c3f06..9923ab4c 100644
--- a/test/functional/src/test_chart_data_labels34.c
+++ b/test/functional/src/test_chart_data_labels34.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_font font1 = {.bold = LXW_TRUE, .italic = LXW_TRUE, .color = LXW_COLOR_RED, .baseline = -1};
     lxw_chart_data_label data_label1 = {. value = "=Sheet1!$D$1", .font = &font1};
@@ -41,8 +41,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels35.c b/test/functional/src/test_chart_data_labels35.c
index 61855823..0f20546e 100644
--- a/test/functional/src/test_chart_data_labels35.c
+++ b/test/functional/src/test_chart_data_labels35.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
 
diff --git a/test/functional/src/test_chart_data_labels36.c b/test/functional/src/test_chart_data_labels36.c
index b9237706..ed41d758 100644
--- a/test/functional/src/test_chart_data_labels36.c
+++ b/test/functional/src/test_chart_data_labels36.c
@@ -30,7 +30,7 @@ int main() {
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_font font = {.name = "Consolas", .pitch_family = 49, .charset = 0, .baseline = -1};
     lxw_chart_line line = {.color = LXW_COLOR_RED};
diff --git a/test/functional/src/test_chart_data_labels37.c b/test/functional/src/test_chart_data_labels37.c
index 0a4a5d82..6c4e2ebf 100644
--- a/test/functional/src/test_chart_data_labels37.c
+++ b/test/functional/src/test_chart_data_labels37.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1,
diff --git a/test/functional/src/test_chart_data_labels38.c b/test/functional/src/test_chart_data_labels38.c
index 24292c5f..4c9d063f 100644
--- a/test/functional/src/test_chart_data_labels38.c
+++ b/test/functional/src/test_chart_data_labels38.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1,
diff --git a/test/functional/src/test_chart_data_labels40.c b/test/functional/src/test_chart_data_labels40.c
index 5d72b2f4..07bc7a5f 100644
--- a/test/functional/src/test_chart_data_labels40.c
+++ b/test/functional/src/test_chart_data_labels40.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
 
@@ -42,8 +42,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels41.c b/test/functional/src/test_chart_data_labels41.c
index 963ac8ec..4993cf05 100644
--- a/test/functional/src/test_chart_data_labels41.c
+++ b/test/functional/src/test_chart_data_labels41.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
 
@@ -42,8 +42,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels42.c b/test/functional/src/test_chart_data_labels42.c
index 4148a64a..8d082c80 100644
--- a/test/functional/src/test_chart_data_labels42.c
+++ b/test/functional/src/test_chart_data_labels42.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
     lxw_chart_font font = {.color = LXW_COLOR_RED, .baseline = -1};
@@ -43,8 +43,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels43.c b/test/functional/src/test_chart_data_labels43.c
index d61e00af..50ed4869 100644
--- a/test/functional/src/test_chart_data_labels43.c
+++ b/test/functional/src/test_chart_data_labels43.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
     lxw_chart_font font = {.bold = LXW_TRUE, .italic = LXW_TRUE, .color = LXW_COLOR_RED, .baseline = -1};
@@ -43,8 +43,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels44.c b/test/functional/src/test_chart_data_labels44.c
index adb3c7fe..ee9f1350 100644
--- a/test/functional/src/test_chart_data_labels44.c
+++ b/test/functional/src/test_chart_data_labels44.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
     lxw_chart_fill fill = {.color = 0x00B050};
@@ -43,8 +43,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels45.c b/test/functional/src/test_chart_data_labels45.c
index 09f6af92..98984a24 100644
--- a/test/functional/src/test_chart_data_labels45.c
+++ b/test/functional/src/test_chart_data_labels45.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
     lxw_chart_fill fill = {.color = 0x00B050};
@@ -42,8 +42,8 @@ int main() {
     lxw_chart_data_label *data_labels[] = {&data_label1, NULL};
 
     chart_series_set_labels_custom(series, data_labels);
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels46.c b/test/functional/src/test_chart_data_labels46.c
index aafe0bff..3401e738 100644
--- a/test/functional/src/test_chart_data_labels46.c
+++ b/test/functional/src/test_chart_data_labels46.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 4; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
     lxw_chart_font font = {.color = LXW_COLOR_RED, .baseline = -1};
@@ -44,8 +44,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels47.c b/test/functional/src/test_chart_data_labels47.c
index fa3f3f80..e5997c0a 100644
--- a/test/functional/src/test_chart_data_labels47.c
+++ b/test/functional/src/test_chart_data_labels47.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
     lxw_chart_font font = {.bold = LXW_TRUE, .italic = LXW_TRUE, .color = LXW_COLOR_RED, .baseline = -1};
@@ -44,8 +44,8 @@ int main() {
 
     chart_series_set_labels_custom(series, data_labels);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_data_labels48.c b/test/functional/src/test_chart_data_labels48.c
index 02f549e5..66faf315 100644
--- a/test/functional/src/test_chart_data_labels48.c
+++ b/test/functional/src/test_chart_data_labels48.c
@@ -38,9 +38,9 @@ int main() {
     lxw_chart_data_label *data_labels1[] = {&data_label1, NULL};
     lxw_chart_data_label *data_labels2[] = {&data_label2, NULL};
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels49.c b/test/functional/src/test_chart_data_labels49.c
index 959a9a45..9573189d 100644
--- a/test/functional/src/test_chart_data_labels49.c
+++ b/test/functional/src/test_chart_data_labels49.c
@@ -38,9 +38,9 @@ int main() {
     lxw_chart_data_label *data_labels1[] = {&data_label1, NULL};
     lxw_chart_data_label *data_labels2[] = {&data_label2, NULL};
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series1);
     chart_series_set_labels(series2);
diff --git a/test/functional/src/test_chart_data_labels50.c b/test/functional/src/test_chart_data_labels50.c
index e01c175c..7f1227ac 100644
--- a/test/functional/src/test_chart_data_labels50.c
+++ b/test/functional/src/test_chart_data_labels50.c
@@ -41,12 +41,12 @@ int main() {
     lxw_chart_data_label data_label1 = {.line = &line, .font = &font};
     lxw_chart_data_label *data_labels[] = {&data_label1, NULL};
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
     chart_series_set_labels_custom(series, data_labels);
     chart_series_set_labels_position(series, LXW_CHART_LABEL_POSITION_CENTER);
 
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_date01.c b/test/functional/src/test_chart_date01.c
new file mode 100644
index 00000000..3d3990f3
--- /dev/null
+++ b/test/functional/src/test_chart_date01.c
@@ -0,0 +1,62 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_date01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* Date format. */
+    lxw_format *date_format = workbook_add_format(workbook);
+    format_set_num_format_index(date_format, 14);
+
+    /* Set column width. */
+    worksheet_set_column(worksheet, 0, 0, 12, NULL);
+
+    /* Write date values (2013-01-01 to 2013-01-10). */
+    lxw_datetime dates[] = {
+        {2013, 1, 1, 0, 0, 0.0},
+        {2013, 1, 2, 0, 0, 0.0},
+        {2013, 1, 3, 0, 0, 0.0},
+        {2013, 1, 4, 0, 0, 0.0},
+        {2013, 1, 5, 0, 0, 0.0},
+        {2013, 1, 6, 0, 0, 0.0},
+        {2013, 1, 7, 0, 0, 0.0},
+        {2013, 1, 8, 0, 0, 0.0},
+        {2013, 1, 9, 0, 0, 0.0},
+        {2013, 1, 10, 0, 0, 0.0}
+    };
+
+    for (int i = 0; i < 10; i++) {
+        worksheet_write_datetime(worksheet, i, 0, &dates[i], date_format);
+    }
+
+    /* Write data values. */
+    int values[] = {10, 30, 20, 40, 20, 60, 50, 40, 30, 30};
+    for (int i = 0; i < 10; i++) {
+        worksheet_write_number(worksheet, i, 1, values[i], NULL);
+    }
+
+    /* Add chart series. */
+    chart_add_series(chart, "=Sheet1!$A$1:$A$10", "=Sheet1!$B$1:$B$10");
+
+    /* Set the X axis as a date axis with linked format. */
+    chart_axis_set_date_axis(chart->x_axis);
+    chart_axis_set_num_format(chart->x_axis, "dd/mm/yyyy");
+    chart->x_axis->source_linked = LXW_TRUE;
+
+    /* Insert the chart. */
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_display_units01.c b/test/functional/src/test_chart_display_units01.c
index bbf0fbae..517e0b24 100644
--- a/test/functional/src/test_chart_display_units01.c
+++ b/test/functional/src/test_chart_display_units01.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_display_units02.c b/test/functional/src/test_chart_display_units02.c
index 8cfa14b6..005f069c 100644
--- a/test/functional/src/test_chart_display_units02.c
+++ b/test/functional/src/test_chart_display_units02.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_HUNDREDS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units03.c b/test/functional/src/test_chart_display_units03.c
index 64336a85..671683dc 100644
--- a/test/functional/src/test_chart_display_units03.c
+++ b/test/functional/src/test_chart_display_units03.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_THOUSANDS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units04.c b/test/functional/src/test_chart_display_units04.c
index feb2b2c7..3aeb118e 100644
--- a/test/functional/src/test_chart_display_units04.c
+++ b/test/functional/src/test_chart_display_units04.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_TEN_THOUSANDS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units05.c b/test/functional/src/test_chart_display_units05.c
index 80c677cb..d7608f82 100644
--- a/test/functional/src/test_chart_display_units05.c
+++ b/test/functional/src/test_chart_display_units05.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_HUNDRED_THOUSANDS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units06.c b/test/functional/src/test_chart_display_units06.c
index c8ee60c8..a0541714 100644
--- a/test/functional/src/test_chart_display_units06.c
+++ b/test/functional/src/test_chart_display_units06.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_MILLIONS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units07.c b/test/functional/src/test_chart_display_units07.c
index a936568b..3e6dd440 100644
--- a/test/functional/src/test_chart_display_units07.c
+++ b/test/functional/src/test_chart_display_units07.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_TEN_MILLIONS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units08.c b/test/functional/src/test_chart_display_units08.c
index 9643256c..a1d156b8 100644
--- a/test/functional/src/test_chart_display_units08.c
+++ b/test/functional/src/test_chart_display_units08.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_HUNDRED_MILLIONS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units09.c b/test/functional/src/test_chart_display_units09.c
index 7c9e6615..c09afc06 100644
--- a/test/functional/src/test_chart_display_units09.c
+++ b/test/functional/src/test_chart_display_units09.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_BILLIONS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units10.c b/test/functional/src/test_chart_display_units10.c
index 361d48dc..83f4ffb5 100644
--- a/test/functional/src/test_chart_display_units10.c
+++ b/test/functional/src/test_chart_display_units10.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_TRILLIONS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_display_units11.c b/test/functional/src/test_chart_display_units11.c
index ab7431e2..e95d8217 100644
--- a/test/functional/src/test_chart_display_units11.c
+++ b/test/functional/src/test_chart_display_units11.c
@@ -26,7 +26,7 @@ int main() {
     worksheet_write_number(worksheet, 3, 0, 20000000, NULL);
     worksheet_write_number(worksheet, 4, 0, 10000000, NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_HUNDREDS);
 
diff --git a/test/functional/src/test_chart_display_units12.c b/test/functional/src/test_chart_display_units12.c
index bca0b384..eb9f9305 100644
--- a/test/functional/src/test_chart_display_units12.c
+++ b/test/functional/src/test_chart_display_units12.c
@@ -35,7 +35,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_axis_set_display_units(chart->y_axis, LXW_CHART_AXIS_UNITS_HUNDREDS);
     chart_axis_set_display_units_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_doughnut01.c b/test/functional/src/test_chart_doughnut01.c
index 0009bbdb..f714ed7d 100644
--- a/test/functional/src/test_chart_doughnut01.c
+++ b/test/functional/src/test_chart_doughnut01.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_doughnut02.c b/test/functional/src/test_chart_doughnut02.c
index 4c0da865..3d195f37 100644
--- a/test/functional/src/test_chart_doughnut02.c
+++ b/test/functional/src/test_chart_doughnut02.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     chart_set_hole_size(chart, 10);
 
diff --git a/test/functional/src/test_chart_doughnut03.c b/test/functional/src/test_chart_doughnut03.c
index 465518b7..6116755f 100644
--- a/test/functional/src/test_chart_doughnut03.c
+++ b/test/functional/src/test_chart_doughnut03.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     chart_set_hole_size(chart, 90);
 
diff --git a/test/functional/src/test_chart_doughnut04.c b/test/functional/src/test_chart_doughnut04.c
index cb4c4178..8b23d77d 100644
--- a/test/functional/src/test_chart_doughnut04.c
+++ b/test/functional/src/test_chart_doughnut04.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     chart_set_rotation(chart, 30);
 
diff --git a/test/functional/src/test_chart_doughnut05.c b/test/functional/src/test_chart_doughnut05.c
index 3f2ab397..2fedaa28 100644
--- a/test/functional/src/test_chart_doughnut05.c
+++ b/test/functional/src/test_chart_doughnut05.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     chart_set_rotation(chart, 360);
 
diff --git a/test/functional/src/test_chart_doughnut06.c b/test/functional/src/test_chart_doughnut06.c
index 9f07eed4..9c66a3d0 100644
--- a/test/functional/src/test_chart_doughnut06.c
+++ b/test/functional/src/test_chart_doughnut06.c
@@ -27,8 +27,8 @@ int main() {
         for (col = 0; col < 2; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_drop_lines01.c b/test/functional/src/test_chart_drop_lines01.c
index 10169b50..fd660fbd 100644
--- a/test/functional/src/test_chart_drop_lines01.c
+++ b/test/functional/src/test_chart_drop_lines01.c
@@ -38,12 +38,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_drop_lines02.c b/test/functional/src/test_chart_drop_lines02.c
index cf4918df..50759dc1 100644
--- a/test/functional/src/test_chart_drop_lines02.c
+++ b/test/functional/src/test_chart_drop_lines02.c
@@ -41,12 +41,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_drop_lines03.c b/test/functional/src/test_chart_drop_lines03.c
index f41d4d21..670e34ac 100644
--- a/test/functional/src/test_chart_drop_lines03.c
+++ b/test/functional/src/test_chart_drop_lines03.c
@@ -38,12 +38,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_errorbars01.c b/test/functional/src/test_chart_errorbars01.c
index 2b50ebd2..74b48345 100644
--- a/test/functional/src/test_chart_errorbars01.c
+++ b/test/functional/src/test_chart_errorbars01.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     chart_series_set_error_bars(series1->y_error_bars,
diff --git a/test/functional/src/test_chart_errorbars02.c b/test/functional/src/test_chart_errorbars02.c
index a18e9673..a466e5f6 100644
--- a/test/functional/src/test_chart_errorbars02.c
+++ b/test/functional/src/test_chart_errorbars02.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     chart_series_set_error_bars(series1->y_error_bars,
diff --git a/test/functional/src/test_chart_errorbars03.c b/test/functional/src/test_chart_errorbars03.c
index 02c63bb7..1f32f31b 100644
--- a/test/functional/src/test_chart_errorbars03.c
+++ b/test/functional/src/test_chart_errorbars03.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
diff --git a/test/functional/src/test_chart_errorbars04.c b/test/functional/src/test_chart_errorbars04.c
index c6f29fbb..e2d90dbe 100644
--- a/test/functional/src/test_chart_errorbars04.c
+++ b/test/functional/src/test_chart_errorbars04.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_series_error_bars *x_error_bars;
     lxw_series_error_bars *y_error_bars;
diff --git a/test/functional/src/test_chart_errorbars05.c b/test/functional/src/test_chart_errorbars05.c
index a4575bf6..e9a4cf1d 100644
--- a/test/functional/src/test_chart_errorbars05.c
+++ b/test/functional/src/test_chart_errorbars05.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_error_bars(series1->x_error_bars,
                                 LXW_CHART_ERROR_BAR_TYPE_STD_ERROR, 0);
diff --git a/test/functional/src/test_chart_errorbars06.c b/test/functional/src/test_chart_errorbars06.c
index 5a373b27..e5dd2c13 100644
--- a/test/functional/src/test_chart_errorbars06.c
+++ b/test/functional/src/test_chart_errorbars06.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_error_bars(series1->y_error_bars,
                                 LXW_CHART_ERROR_BAR_TYPE_STD_ERROR, 0);
diff --git a/test/functional/src/test_chart_font01.c b/test/functional/src/test_chart_font01.c
index 459a88b4..7a220840 100644
--- a/test/functional/src/test_chart_font01.c
+++ b/test/functional/src/test_chart_font01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_title_set_name(chart, "Title");
 
diff --git a/test/functional/src/test_chart_font02.c b/test/functional/src/test_chart_font02.c
index ccf97780..93f79838 100644
--- a/test/functional/src/test_chart_font02.c
+++ b/test/functional/src/test_chart_font02.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_title_set_name(chart, "Title");
 
diff --git a/test/functional/src/test_chart_font03.c b/test/functional/src/test_chart_font03.c
index 3f5394b7..d17bac46 100644
--- a/test/functional/src/test_chart_font03.c
+++ b/test/functional/src/test_chart_font03.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.italic = LXW_TRUE};
     lxw_chart_font font2 = {.bold = LXW_TRUE, .italic = LXW_TRUE};
diff --git a/test/functional/src/test_chart_font04.c b/test/functional/src/test_chart_font04.c
index 2b6cb3da..7ea90892 100644
--- a/test/functional/src/test_chart_font04.c
+++ b/test/functional/src/test_chart_font04.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.italic = LXW_TRUE};
     lxw_chart_font font2 = {.bold = LXW_TRUE, .italic = LXW_TRUE};
diff --git a/test/functional/src/test_chart_font05.c b/test/functional/src/test_chart_font05.c
index 3aa7fb26..a3414faa 100644
--- a/test/functional/src/test_chart_font05.c
+++ b/test/functional/src/test_chart_font05.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_title_set_name(chart, "Title");
 
diff --git a/test/functional/src/test_chart_font06.c b/test/functional/src/test_chart_font06.c
index 38c96f3a..f01d0dd1 100644
--- a/test/functional/src/test_chart_font06.c
+++ b/test/functional/src/test_chart_font06.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
     lxw_chart_font font1 = {.name = "Calibri",     .pitch_family = 34, .charset = 0, .color = LXW_COLOR_YELLOW};
diff --git a/test/functional/src/test_chart_font07.c b/test/functional/src/test_chart_font07.c
index 763457a0..1416559f 100644
--- a/test/functional/src/test_chart_font07.c
+++ b/test/functional/src/test_chart_font07.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.size = 9, .baseline = -1};
     chart_legend_set_font(chart, &font1);
diff --git a/test/functional/src/test_chart_font08.c b/test/functional/src/test_chart_font08.c
index 89cbf040..6c2909c0 100644
--- a/test/functional/src/test_chart_font08.c
+++ b/test/functional/src/test_chart_font08.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.bold = LXW_TRUE, .italic = LXW_TRUE, .baseline = -1};
     chart_legend_set_font(chart, &font1);
diff --git a/test/functional/src/test_chart_font09.c b/test/functional/src/test_chart_font09.c
index 493538da..410f15af 100644
--- a/test/functional/src/test_chart_font09.c
+++ b/test/functional/src/test_chart_font09.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_font font1 = {.rotation = -45, .baseline = -1};
 
diff --git a/test/functional/src/test_chart_format01.c b/test/functional/src/test_chart_format01.c
index 89ab1630..7de76470 100644
--- a/test/functional/src/test_chart_format01.c
+++ b/test/functional/src/test_chart_format01.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_format02.c b/test/functional/src/test_chart_format02.c
index e7aba466..5a38687b 100644
--- a/test/functional/src/test_chart_format02.c
+++ b/test/functional/src/test_chart_format02.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED};
 
diff --git a/test/functional/src/test_chart_format03.c b/test/functional/src/test_chart_format03.c
index 5ce9fefc..9a918f84 100644
--- a/test/functional/src/test_chart_format03.c
+++ b/test/functional/src/test_chart_format03.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_YELLOW};
     lxw_chart_fill fill = {.color = LXW_COLOR_RED};
diff --git a/test/functional/src/test_chart_format04.c b/test/functional/src/test_chart_format04.c
index 1ca07502..05f4d023 100644
--- a/test/functional/src/test_chart_format04.c
+++ b/test/functional/src/test_chart_format04.c
@@ -36,12 +36,12 @@ int main() {
    lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_fill fill = {.color = 0xFF0000};
 
diff --git a/test/functional/src/test_chart_format05.c b/test/functional/src/test_chart_format05.c
index 0176ee68..43ade30f 100644
--- a/test/functional/src/test_chart_format05.c
+++ b/test/functional/src/test_chart_format05.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     chart_series_set_marker_type(series, LXW_CHART_MARKER_AUTOMATIC);
diff --git a/test/functional/src/test_chart_format06.c b/test/functional/src/test_chart_format06.c
index eb704993..47a0f06d 100644
--- a/test/functional/src/test_chart_format06.c
+++ b/test/functional/src/test_chart_format06.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     chart_series_set_marker_type(series, LXW_CHART_MARKER_DIAMOND);
diff --git a/test/functional/src/test_chart_format07.c b/test/functional/src/test_chart_format07.c
index 05bee6c8..8b3361e5 100644
--- a/test/functional/src/test_chart_format07.c
+++ b/test/functional/src/test_chart_format07.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_YELLOW};
     lxw_chart_fill fill = {.color = LXW_COLOR_RED};
diff --git a/test/functional/src/test_chart_format08.c b/test/functional/src/test_chart_format08.c
index 3d810e84..3812b495 100644
--- a/test/functional/src/test_chart_format08.c
+++ b/test/functional/src/test_chart_format08.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_trendline(series, LXW_CHART_TRENDLINE_TYPE_LINEAR, 0);
 
diff --git a/test/functional/src/test_chart_format09.c b/test/functional/src/test_chart_format09.c
index 424b1262..94043e06 100644
--- a/test/functional/src/test_chart_format09.c
+++ b/test/functional/src/test_chart_format09.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1.25,
diff --git a/test/functional/src/test_chart_format10.c b/test/functional/src/test_chart_format10.c
index d1e1db24..f3fc7f95 100644
--- a/test/functional/src/test_chart_format10.c
+++ b/test/functional/src/test_chart_format10.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1,
diff --git a/test/functional/src/test_chart_format11.c b/test/functional/src/test_chart_format11.c
index 9e3b6639..c14f411f 100644
--- a/test/functional/src/test_chart_format11.c
+++ b/test/functional/src/test_chart_format11.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1,
diff --git a/test/functional/src/test_chart_format12.c b/test/functional/src/test_chart_format12.c
index af32e4c4..31d984c9 100644
--- a/test/functional/src/test_chart_format12.c
+++ b/test/functional/src/test_chart_format12.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1,
diff --git a/test/functional/src/test_chart_format13.c b/test/functional/src/test_chart_format13.c
index 7c61be14..56a34fe7 100644
--- a/test/functional/src/test_chart_format13.c
+++ b/test/functional/src/test_chart_format13.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_labels(series);
 
diff --git a/test/functional/src/test_chart_format14.c b/test/functional/src/test_chart_format14.c
index a64fe77e..91307a0d 100644
--- a/test/functional/src/test_chart_format14.c
+++ b/test/functional/src/test_chart_format14.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_labels(series);
     chart_series_set_labels_options(series, LXW_TRUE, LXW_TRUE, LXW_TRUE);
diff --git a/test/functional/src/test_chart_format15.c b/test/functional/src/test_chart_format15.c
index f53a37c8..65260e69 100644
--- a/test/functional/src/test_chart_format15.c
+++ b/test/functional/src/test_chart_format15.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_trendline(series, LXW_CHART_TRENDLINE_TYPE_LINEAR, 0);
 
diff --git a/test/functional/src/test_chart_format16.c b/test/functional/src/test_chart_format16.c
index d4e84571..0bcfb17e 100644
--- a/test/functional/src/test_chart_format16.c
+++ b/test/functional/src/test_chart_format16.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_labels(series);
     chart_series_set_labels_options(series, LXW_TRUE, LXW_TRUE, LXW_TRUE);
diff --git a/test/functional/src/test_chart_format17.c b/test/functional/src/test_chart_format17.c
index a4a2f295..d1eb6f2d 100644
--- a/test/functional/src/test_chart_format17.c
+++ b/test/functional/src/test_chart_format17.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_fill fill = {.none = LXW_TRUE};
     chart_series_set_fill(series1, &fill);
diff --git a/test/functional/src/test_chart_format18.c b/test/functional/src/test_chart_format18.c
index 035e1ede..b7cd30af 100644
--- a/test/functional/src/test_chart_format18.c
+++ b/test/functional/src/test_chart_format18.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line line = {.none = LXW_TRUE};
     lxw_chart_fill fill = {.none = LXW_TRUE};
diff --git a/test/functional/src/test_chart_format19.c b/test/functional/src/test_chart_format19.c
index 8a7e43b4..c129cafa 100644
--- a/test/functional/src/test_chart_format19.c
+++ b/test/functional/src/test_chart_format19.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_labels(series);
     chart_series_set_labels_position(series, LXW_CHART_LABEL_POSITION_INSIDE_BASE);
diff --git a/test/functional/src/test_chart_format20.c b/test/functional/src/test_chart_format20.c
index 7a694f31..9f586d8f 100644
--- a/test/functional/src/test_chart_format20.c
+++ b/test/functional/src/test_chart_format20.c
@@ -37,11 +37,11 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart1, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart1, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart1, NULL, "=Sheet1!$C$1:$C$5", 0);
 
-    lxw_chart_series *series2 = chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart2, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series2 = chart_add_series(chart2, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart2, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
diff --git a/test/functional/src/test_chart_format21.c b/test/functional/src/test_chart_format21.c
index 0b4849ae..2c75334c 100644
--- a/test/functional/src/test_chart_format21.c
+++ b/test/functional/src/test_chart_format21.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_YELLOW};
     lxw_chart_fill fill = {.color = LXW_COLOR_RED, .transparency = 24};
diff --git a/test/functional/src/test_chart_format22.c b/test/functional/src/test_chart_format22.c
index 478d04cd..da2f9b38 100644
--- a/test/functional/src/test_chart_format22.c
+++ b/test/functional/src/test_chart_format22.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_YELLOW};
     lxw_chart_fill fill = {.color = LXW_COLOR_RED, .transparency = 1};
diff --git a/test/functional/src/test_chart_format23.c b/test/functional/src/test_chart_format23.c
index 865fe145..c528cdee 100644
--- a/test/functional/src/test_chart_format23.c
+++ b/test/functional/src/test_chart_format23.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_YELLOW};
     lxw_chart_fill fill = {.color = LXW_COLOR_RED, .transparency = 100};
diff --git a/test/functional/src/test_chart_format24.c b/test/functional/src/test_chart_format24.c
index e44166cb..1e413347 100644
--- a/test/functional/src/test_chart_format24.c
+++ b/test/functional/src/test_chart_format24.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     lxw_chart_fill fill1 = {.color = LXW_COLOR_YELLOW, .transparency = 75};
diff --git a/test/functional/src/test_chart_format25.c b/test/functional/src/test_chart_format25.c
index 462c9a2b..e71d346f 100644
--- a/test/functional/src/test_chart_format25.c
+++ b/test/functional/src/test_chart_format25.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color = LXW_COLOR_RED, .transparency = 50};
 
diff --git a/test/functional/src/test_chart_format26.c b/test/functional/src/test_chart_format26.c
index cea96f7a..e32c0156 100644
--- a/test/functional/src/test_chart_format26.c
+++ b/test/functional/src/test_chart_format26.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_trendline(series, LXW_CHART_TRENDLINE_TYPE_LINEAR, 0);
     chart_series_set_trendline_equation(series);
diff --git a/test/functional/src/test_chart_format27.c b/test/functional/src/test_chart_format27.c
index ed5b9aae..3cf56d57 100644
--- a/test/functional/src/test_chart_format27.c
+++ b/test/functional/src/test_chart_format27.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1,
diff --git a/test/functional/src/test_chart_format28.c b/test/functional/src/test_chart_format28.c
index 14d314fa..a2cf84a6 100644
--- a/test/functional/src/test_chart_format28.c
+++ b/test/functional/src/test_chart_format28.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_trendline(series, LXW_CHART_TRENDLINE_TYPE_LINEAR, 0);
     chart_series_set_trendline_equation(series);
diff --git a/test/functional/src/test_chart_format29.c b/test/functional/src/test_chart_format29.c
index 88f8504e..f2b03b1a 100644
--- a/test/functional/src/test_chart_format29.c
+++ b/test/functional/src/test_chart_format29.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1,
diff --git a/test/functional/src/test_chart_format30.c b/test/functional/src/test_chart_format30.c
index 20b1cca1..8556b0ef 100644
--- a/test/functional/src/test_chart_format30.c
+++ b/test/functional/src/test_chart_format30.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_trendline(series, LXW_CHART_TRENDLINE_TYPE_LINEAR, 0);
     chart_series_set_trendline_equation(series);
diff --git a/test/functional/src/test_chart_format31.c b/test/functional/src/test_chart_format31.c
index c129aa38..8b2dca2b 100644
--- a/test/functional/src/test_chart_format31.c
+++ b/test/functional/src/test_chart_format31.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line = {.color     = LXW_COLOR_RED,
                            .width     = 1,
diff --git a/test/functional/src/test_chart_format32.c b/test/functional/src/test_chart_format32.c
index 4f9a26df..2c452c6d 100644
--- a/test/functional/src/test_chart_format32.c
+++ b/test/functional/src/test_chart_format32.c
@@ -35,12 +35,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line line1 = {.width = 5};
     lxw_chart_line line2 = {.width = 0.1};
diff --git a/test/functional/src/test_chart_gap01.c b/test/functional/src/test_chart_gap01.c
index f95d0d7d..d33b6e05 100644
--- a/test/functional/src/test_chart_gap01.c
+++ b/test/functional/src/test_chart_gap01.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_set_series_overlap(chart, 5);
     chart_set_series_gap(chart, 157);
diff --git a/test/functional/src/test_chart_gap02.c b/test/functional/src/test_chart_gap02.c
index f1f1bd7f..20d87a6e 100644
--- a/test/functional/src/test_chart_gap02.c
+++ b/test/functional/src/test_chart_gap02.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_set_series_overlap(chart, -100);
     chart_set_series_gap(chart, 0);
diff --git a/test/functional/src/test_chart_gap03.c b/test/functional/src/test_chart_gap03.c
index 95c339e9..bf605ad5 100644
--- a/test/functional/src/test_chart_gap03.c
+++ b/test/functional/src/test_chart_gap03.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_set_series_overlap(chart, 100);
     chart_set_series_gap(chart, 500);
diff --git a/test/functional/src/test_chart_gap04.c b/test/functional/src/test_chart_gap04.c
new file mode 100644
index 00000000..0d208f7d
--- /dev/null
+++ b/test/functional/src/test_chart_gap04.c
@@ -0,0 +1,48 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gap04.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 45938176;
+    chart->axis_id_2 = 59715584;
+    chart->axis_id_3 = 62526208;
+    chart->axis_id_4 = 59718272;
+
+    uint8_t data1[5] = {1, 2, 3, 4, 5};
+    uint8_t data2[5] = {6, 8, 6, 4, 2};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 1);
+
+    /* Set gap and overlap for primary axis. */
+    chart_set_series_gap(chart, 51);
+    chart_set_series_overlap(chart, 12);
+
+    /* Set gap and overlap for secondary axis. */
+    chart_set_series_gap_y2(chart, 251);
+    chart_set_series_overlap_y2(chart, -27);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gap05.c b/test/functional/src/test_chart_gap05.c
new file mode 100644
index 00000000..0fec76a6
--- /dev/null
+++ b/test/functional/src/test_chart_gap05.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gap05.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_BAR);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 45938176;
+    chart->axis_id_2 = 59715584;
+    chart->axis_id_3 = 70848512;
+    chart->axis_id_4 = 54519680;
+
+    uint8_t data1[5] = {1, 2, 3, 4, 5};
+    uint8_t data2[5] = {6, 8, 6, 4, 2};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 1);
+
+    /* Set gap and overlap for primary axis. */
+    chart_set_series_gap(chart, 51);
+    chart_set_series_overlap(chart, 12);
+
+    /* Set gap and overlap for secondary axis. */
+    chart_set_series_gap_y2(chart, 251);
+    chart_set_series_overlap_y2(chart, -27);
+
+    /* Set x2 axis label position to next_to. */
+    chart_axis_set_label_position(chart->x2_axis, LXW_CHART_AXIS_LABEL_POSITION_NEXT_TO);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient01.c b/test/functional/src/test_chart_gradient01.c
new file mode 100644
index 00000000..3d000056
--- /dev/null
+++ b/test/functional/src/test_chart_gradient01.c
@@ -0,0 +1,50 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 61365248;
+    chart->axis_id_2 = 64275200;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient02.c b/test/functional/src/test_chart_gradient02.c
new file mode 100644
index 00000000..d5d290ff
--- /dev/null
+++ b/test/functional/src/test_chart_gradient02.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient02.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 61363328;
+    chart->axis_id_2 = 61364864;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+        .angle = 30,
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient03.c b/test/functional/src/test_chart_gradient03.c
new file mode 100644
index 00000000..b945abff
--- /dev/null
+++ b/test/functional/src/test_chart_gradient03.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient03.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 61363712;
+    chart->axis_id_2 = 61365248;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+        .positions = {0, 40, 100},
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient04.c b/test/functional/src/test_chart_gradient04.c
new file mode 100644
index 00000000..ffd888a9
--- /dev/null
+++ b/test/functional/src/test_chart_gradient04.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient04.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 61363712;
+    chart->axis_id_2 = 61365248;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+        .type = LXW_CHART_GRADIENT_FILL_RADIAL,
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient05.c b/test/functional/src/test_chart_gradient05.c
new file mode 100644
index 00000000..e1cd859e
--- /dev/null
+++ b/test/functional/src/test_chart_gradient05.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient05.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 61363712;
+    chart->axis_id_2 = 61365248;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+        .type = LXW_CHART_GRADIENT_FILL_RECTANGULAR,
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient06.c b/test/functional/src/test_chart_gradient06.c
new file mode 100644
index 00000000..743c9df2
--- /dev/null
+++ b/test/functional/src/test_chart_gradient06.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient06.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 61363328;
+    chart->axis_id_2 = 61364864;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+        .type = LXW_CHART_GRADIENT_FILL_PATH,
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient07.c b/test/functional/src/test_chart_gradient07.c
new file mode 100644
index 00000000..40bfdcc7
--- /dev/null
+++ b/test/functional/src/test_chart_gradient07.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient07.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 68936064;
+    chart->axis_id_2 = 68937600;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+    };
+    chart_series_set_gradient(series1, &gradient);
+    chart_series_set_invert_if_negative(series1);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient08.c b/test/functional/src/test_chart_gradient08.c
new file mode 100644
index 00000000..d85166c1
--- /dev/null
+++ b/test/functional/src/test_chart_gradient08.c
@@ -0,0 +1,50 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient08.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 69014272;
+    chart->axis_id_2 = 69016192;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+    };
+    chart_chartarea_set_gradient(chart, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient09.c b/test/functional/src/test_chart_gradient09.c
new file mode 100644
index 00000000..fa007d64
--- /dev/null
+++ b/test/functional/src/test_chart_gradient09.c
@@ -0,0 +1,50 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient09.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 56159616;
+    chart->axis_id_2 = 61364480;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+    };
+    chart_plotarea_set_gradient(chart, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient10.c b/test/functional/src/test_chart_gradient10.c
new file mode 100644
index 00000000..28f36db7
--- /dev/null
+++ b/test/functional/src/test_chart_gradient10.c
@@ -0,0 +1,50 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient10.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 56159232;
+    chart->axis_id_2 = 61364096;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x156B13},
+        .num_stops = 2,
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient11.c b/test/functional/src/test_chart_gradient11.c
new file mode 100644
index 00000000..ed22cf31
--- /dev/null
+++ b/test/functional/src/test_chart_gradient11.c
@@ -0,0 +1,50 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient11.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 66738048;
+    chart->axis_id_2 = 66748416;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 4,
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient12.c b/test/functional/src/test_chart_gradient12.c
new file mode 100644
index 00000000..86ac2175
--- /dev/null
+++ b/test/functional/src/test_chart_gradient12.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient12.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 56159232;
+    chart->axis_id_2 = 61364096;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x156B13},
+        .num_stops = 2,
+        .positions = {10, 90},
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gradient13.c b/test/functional/src/test_chart_gradient13.c
new file mode 100644
index 00000000..49f73ff5
--- /dev/null
+++ b/test/functional/src/test_chart_gradient13.c
@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_gradient13.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_COLUMN);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 56159232;
+    chart->axis_id_2 = 61364096;
+
+    uint8_t data[5][3] = {
+        {1, 2,  3},
+        {2, 4,  6},
+        {3, 6,  9},
+        {4, 8,  12},
+        {5, 10, 15}
+    };
+
+    int row, col;
+    for (row = 0; row < 5; row++)
+        for (col = 0; col < 3; col++)
+            worksheet_write_number(worksheet, row, col, data[row][col], NULL);
+
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+
+    lxw_chart_gradient_fill gradient = {
+        .colors = {0xDDEBCF, 0x9CB86E, 0x156B13},
+        .num_stops = 3,
+        .angle = 355,
+    };
+    chart_series_set_gradient(series1, &gradient);
+
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_gridlines01.c b/test/functional/src/test_chart_gridlines01.c
index 9948241e..256ede83 100644
--- a/test/functional/src/test_chart_gridlines01.c
+++ b/test/functional/src/test_chart_gridlines01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_axis *x_axis = chart_axis_get(chart, LXW_CHART_AXIS_TYPE_X);
     lxw_chart_axis *y_axis = chart_axis_get(chart, LXW_CHART_AXIS_TYPE_Y);
diff --git a/test/functional/src/test_chart_gridlines02.c b/test/functional/src/test_chart_gridlines02.c
index 46c3d40d..4b47d8ba 100644
--- a/test/functional/src/test_chart_gridlines02.c
+++ b/test/functional/src/test_chart_gridlines02.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_major_gridlines_set_visible(chart->x_axis, LXW_TRUE);
     chart_axis_major_gridlines_set_visible(chart->y_axis, LXW_FALSE);
diff --git a/test/functional/src/test_chart_gridlines04.c b/test/functional/src/test_chart_gridlines04.c
index 513510e4..5c419f9f 100644
--- a/test/functional/src/test_chart_gridlines04.c
+++ b/test/functional/src/test_chart_gridlines04.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_major_gridlines_set_visible(chart->y_axis, LXW_FALSE);
 
diff --git a/test/functional/src/test_chart_gridlines05.c b/test/functional/src/test_chart_gridlines05.c
index c201d80f..76d5ceee 100644
--- a/test/functional/src/test_chart_gridlines05.c
+++ b/test/functional/src/test_chart_gridlines05.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
     chart_axis_major_gridlines_set_visible(chart->x_axis, LXW_TRUE);
diff --git a/test/functional/src/test_chart_gridlines06.c b/test/functional/src/test_chart_gridlines06.c
index 9117adbf..97e02929 100644
--- a/test/functional/src/test_chart_gridlines06.c
+++ b/test/functional/src/test_chart_gridlines06.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_major_gridlines_set_visible(chart->x_axis, LXW_TRUE);
     chart_axis_minor_gridlines_set_visible(chart->x_axis, LXW_TRUE);
diff --git a/test/functional/src/test_chart_gridlines08.c b/test/functional/src/test_chart_gridlines08.c
index 4c3e643a..d9650e2f 100644
--- a/test/functional/src/test_chart_gridlines08.c
+++ b/test/functional/src/test_chart_gridlines08.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_axis_major_gridlines_set_visible(chart->y_axis, LXW_TRUE);
     chart_axis_minor_gridlines_set_visible(chart->y_axis, LXW_TRUE);
diff --git a/test/functional/src/test_chart_gridlines09.c b/test/functional/src/test_chart_gridlines09.c
index e75f5784..65f57bdc 100644
--- a/test/functional/src/test_chart_gridlines09.c
+++ b/test/functional/src/test_chart_gridlines09.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
     lxw_chart_line line1 = {.color = LXW_COLOR_RED,
diff --git a/test/functional/src/test_chart_high_low_lines01.c b/test/functional/src/test_chart_high_low_lines01.c
index 57c15ccd..96cb0d0a 100644
--- a/test/functional/src/test_chart_high_low_lines01.c
+++ b/test/functional/src/test_chart_high_low_lines01.c
@@ -38,12 +38,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_high_low_lines02.c b/test/functional/src/test_chart_high_low_lines02.c
index 527e9a6d..26ddf2b0 100644
--- a/test/functional/src/test_chart_high_low_lines02.c
+++ b/test/functional/src/test_chart_high_low_lines02.c
@@ -41,12 +41,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_layout01.c b/test/functional/src/test_chart_layout01.c
index 2d65c7ac..9653ec89 100644
--- a/test/functional/src/test_chart_layout01.c
+++ b/test/functional/src/test_chart_layout01.c
@@ -32,9 +32,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_layout layout = {
         .x = 0.13171062992125,
diff --git a/test/functional/src/test_chart_layout02.c b/test/functional/src/test_chart_layout02.c
index d245bd41..6399307e 100644
--- a/test/functional/src/test_chart_layout02.c
+++ b/test/functional/src/test_chart_layout02.c
@@ -32,9 +32,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_layout layout = {
         .x = 0.80197353455818,
diff --git a/test/functional/src/test_chart_layout03.c b/test/functional/src/test_chart_layout03.c
index 3d2e3b96..aae2160b 100644
--- a/test/functional/src/test_chart_layout03.c
+++ b/test/functional/src/test_chart_layout03.c
@@ -32,9 +32,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_layout layout = {
         .x = 0.80197353455818,
diff --git a/test/functional/src/test_chart_layout04.c b/test/functional/src/test_chart_layout04.c
index 02ae3988..d822fea2 100644
--- a/test/functional/src/test_chart_layout04.c
+++ b/test/functional/src/test_chart_layout04.c
@@ -32,9 +32,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
     lxw_chart_layout layout = {
diff --git a/test/functional/src/test_chart_layout05.c b/test/functional/src/test_chart_layout05.c
index 5e4ea98d..400b3f0e 100644
--- a/test/functional/src/test_chart_layout05.c
+++ b/test/functional/src/test_chart_layout05.c
@@ -35,12 +35,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
 
diff --git a/test/functional/src/test_chart_layout06.c b/test/functional/src/test_chart_layout06.c
index a838e091..6587d920 100644
--- a/test/functional/src/test_chart_layout06.c
+++ b/test/functional/src/test_chart_layout06.c
@@ -32,9 +32,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
     lxw_chart_layout layout = {
diff --git a/test/functional/src/test_chart_layout07.c b/test/functional/src/test_chart_layout07.c
index 21673c4e..5bda8e88 100644
--- a/test/functional/src/test_chart_layout07.c
+++ b/test/functional/src/test_chart_layout07.c
@@ -32,9 +32,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_layout layout = {
         .x = 0.359652668416448,
diff --git a/test/functional/src/test_chart_layout08.c b/test/functional/src/test_chart_layout08.c
index 2f73b41e..f402d62f 100644
--- a/test/functional/src/test_chart_layout08.c
+++ b/test/functional/src/test_chart_layout08.c
@@ -32,9 +32,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_layout layout = {
         .x = 0.359652668416448,
diff --git a/test/functional/src/test_chart_legend01.c b/test/functional/src/test_chart_legend01.c
index 447fad3d..dddeb12c 100644
--- a/test/functional/src/test_chart_legend01.c
+++ b/test/functional/src/test_chart_legend01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_legend_set_position(chart, LXW_CHART_LEGEND_NONE);
 
diff --git a/test/functional/src/test_chart_legend03.c b/test/functional/src/test_chart_legend03.c
index 23c82a46..01eef032 100644
--- a/test/functional/src/test_chart_legend03.c
+++ b/test/functional/src/test_chart_legend03.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_legend_set_position(chart, LXW_CHART_LEGEND_TOP_RIGHT);
 
diff --git a/test/functional/src/test_chart_legend04.c b/test/functional/src/test_chart_legend04.c
index 01bb0e56..4f3f792e 100644
--- a/test/functional/src/test_chart_legend04.c
+++ b/test/functional/src/test_chart_legend04.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_legend_set_position(chart, LXW_CHART_LEGEND_OVERLAY_TOP_RIGHT);
 
diff --git a/test/functional/src/test_chart_line01.c b/test/functional/src/test_chart_line01.c
index cf3297d0..36fabf18 100644
--- a/test/functional/src/test_chart_line01.c
+++ b/test/functional/src/test_chart_line01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col] , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_line02.c b/test/functional/src/test_chart_line02.c
new file mode 100644
index 00000000..c74b8003
--- /dev/null
+++ b/test/functional/src/test_chart_line02.c
@@ -0,0 +1,40 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_line02.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 63593856;
+    chart->axis_id_2 = 63612032;
+    chart->axis_id_3 = 63615360;
+    chart->axis_id_4 = 63613568;
+
+    uint8_t data1[5] = {1, 2, 3, 4, 5};
+    uint8_t data2[5] = {6, 8, 6, 4, 2};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 1);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_line03.c b/test/functional/src/test_chart_line03.c
index 603d6145..84e4ed1d 100644
--- a/test/functional/src/test_chart_line03.c
+++ b/test/functional/src/test_chart_line03.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_smooth(series, LXW_TRUE);
 
diff --git a/test/functional/src/test_chart_line04.c b/test/functional/src/test_chart_line04.c
index b9ffacab..550edc63 100644
--- a/test/functional/src/test_chart_line04.c
+++ b/test/functional/src/test_chart_line04.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_series_set_smooth(series1, LXW_TRUE);
     chart_series_set_smooth(series3, LXW_TRUE);
diff --git a/test/functional/src/test_chart_line05.c b/test/functional/src/test_chart_line05.c
index 9dd17a31..e563f3a1 100644
--- a/test/functional/src/test_chart_line05.c
+++ b/test/functional/src/test_chart_line05.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_line06.c b/test/functional/src/test_chart_line06.c
index f27cd362..66864cd2 100644
--- a/test/functional/src/test_chart_line06.c
+++ b/test/functional/src/test_chart_line06.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_line07.c b/test/functional/src/test_chart_line07.c
new file mode 100644
index 00000000..038db048
--- /dev/null
+++ b/test/functional/src/test_chart_line07.c
@@ -0,0 +1,58 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_line07.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 77034624;
+    chart->axis_id_2 = 77036544;
+    chart->axis_id_3 = 95388032;
+    chart->axis_id_4 = 103040896;
+
+    uint8_t data1[5] = {1, 2, 3, 4, 5};
+    uint8_t data2[5] = {10, 40, 50, 20, 10};
+    uint8_t data3[7] = {1, 2, 3, 4, 5, 6, 7};
+    uint8_t data4[7] = {30, 10, 20, 40, 30, 10, 20};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+    for (row = 0; row < 7; row++) {
+        worksheet_write_number(worksheet, row, 2, data3[row], NULL);
+        worksheet_write_number(worksheet, row, 3, data4[row], NULL);
+    }
+
+    /* Add series to primary axis. */
+    chart_add_series(chart,
+        "=Sheet1!$A$1:$A$5",
+        "=Sheet1!$B$1:$B$5",
+        0);
+
+    /* Add series to secondary axis. */
+    chart_add_series(chart,
+        "=Sheet1!$C$1:$C$7",
+        "=Sheet1!$D$1:$D$7",
+        1);
+
+    /* Configure secondary X axis to show labels. */
+    chart_axis_set_label_position(chart->x2_axis, LXW_CHART_AXIS_LABEL_POSITION_NEXT_TO);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_line08.c b/test/functional/src/test_chart_line08.c
new file mode 100644
index 00000000..22aec7c7
--- /dev/null
+++ b/test/functional/src/test_chart_line08.c
@@ -0,0 +1,63 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_line08.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_LINE);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 77034624;
+    chart->axis_id_2 = 77036544;
+    chart->axis_id_3 = 95388032;
+    chart->axis_id_4 = 103040896;
+
+    uint8_t data1[5] = {1, 2, 3, 4, 5};
+    uint8_t data2[5] = {10, 40, 50, 20, 10};
+    uint8_t data3[7] = {1, 2, 3, 4, 5, 6, 7};
+    uint8_t data4[7] = {30, 10, 20, 40, 30, 10, 20};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+    }
+    for (row = 0; row < 7; row++) {
+        worksheet_write_number(worksheet, row, 2, data3[row], NULL);
+        worksheet_write_number(worksheet, row, 3, data4[row], NULL);
+    }
+
+    /* Add series to primary axis. */
+    chart_add_series(chart,
+        "=Sheet1!$A$1:$A$5",
+        "=Sheet1!$B$1:$B$5",
+        0);
+
+    /* Add series to secondary axis. */
+    chart_add_series(chart,
+        "=Sheet1!$C$1:$C$7",
+        "=Sheet1!$D$1:$D$7",
+        1);
+
+    /* Configure secondary X axis: visible, with labels, at top. */
+    chart->x2_axis->hidden = LXW_FALSE;
+    chart_axis_set_label_position(chart->x2_axis, LXW_CHART_AXIS_LABEL_POSITION_NEXT_TO);
+    chart->x2_axis->axis_position = LXW_CHART_AXIS_TOP;
+
+    /* Configure secondary Y axis: crossing at max. */
+    chart_axis_set_crossing_max(chart->y2_axis);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_order01.c b/test/functional/src/test_chart_order01.c
index 8cf88ba4..1c4999eb 100644
--- a/test/functional/src/test_chart_order01.c
+++ b/test/functional/src/test_chart_order01.c
@@ -50,10 +50,10 @@ int main() {
             worksheet_write_number(worksheet3, row, col, data[row][col], NULL);
         }
 
-    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart2, NULL, "=Sheet2!$A$1:$A$5");
-    chart_add_series(chart3, NULL, "=Sheet3!$A$1:$A$5");
-    chart_add_series(chart4, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart2, NULL, "=Sheet2!$A$1:$A$5", 0);
+    chart_add_series(chart3, NULL, "=Sheet3!$A$1:$A$5", 0);
+    chart_add_series(chart4, NULL, "=Sheet1!$B$1:$B$5", 0);
 
     worksheet_insert_chart(worksheet1, CELL("E9"),  chart1);
     worksheet_insert_chart(worksheet2, CELL("E9"),  chart2);
diff --git a/test/functional/src/test_chart_order02.c b/test/functional/src/test_chart_order02.c
index e70033c2..3b2ea2b9 100644
--- a/test/functional/src/test_chart_order02.c
+++ b/test/functional/src/test_chart_order02.c
@@ -50,10 +50,10 @@ int main() {
             worksheet_write_number(worksheet3, row, col, data[row][col], NULL);
         }
 
-    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart2, NULL, "=Sheet2!$A$1:$A$5");
-    chart_add_series(chart3, NULL, "=Sheet3!$A$1:$A$5");
-    chart_add_series(chart4, NULL, "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart1, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart2, NULL, "=Sheet2!$A$1:$A$5", 0);
+    chart_add_series(chart3, NULL, "=Sheet3!$A$1:$A$5", 0);
+    chart_add_series(chart4, NULL, "=Sheet1!$B$1:$B$5", 0);
 
     worksheet_insert_chart(worksheet1, CELL("E9"),  chart1);
     worksheet_insert_chart(worksheet2, CELL("E9"),  chart2);
diff --git a/test/functional/src/test_chart_pattern01.c b/test/functional/src/test_chart_pattern01.c
index ae5eccf0..6f127b3b 100644
--- a/test/functional/src/test_chart_pattern01.c
+++ b/test/functional/src/test_chart_pattern01.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_pattern02.c b/test/functional/src/test_chart_pattern02.c
index c419b0ea..3f4a6cf6 100644
--- a/test/functional/src/test_chart_pattern02.c
+++ b/test/functional/src/test_chart_pattern02.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     lxw_chart_pattern pattern1 = {.type     = LXW_CHART_PATTERN_PERCENT_5,
                                   .fg_color = 0xC00000,
diff --git a/test/functional/src/test_chart_pattern03.c b/test/functional/src/test_chart_pattern03.c
index 3f759128..aac6039f 100644
--- a/test/functional/src/test_chart_pattern03.c
+++ b/test/functional/src/test_chart_pattern03.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     lxw_chart_pattern pattern1 = {.type     = LXW_CHART_PATTERN_PERCENT_10,
                                   .fg_color = 0xC00000,
diff --git a/test/functional/src/test_chart_pattern04.c b/test/functional/src/test_chart_pattern04.c
index 74302768..023449ac 100644
--- a/test/functional/src/test_chart_pattern04.c
+++ b/test/functional/src/test_chart_pattern04.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     lxw_chart_pattern pattern1 = {.type     = LXW_CHART_PATTERN_PERCENT_20,
                                   .fg_color = 0xC00000,
diff --git a/test/functional/src/test_chart_pattern05.c b/test/functional/src/test_chart_pattern05.c
index bd0e8259..1c80d56d 100644
--- a/test/functional/src/test_chart_pattern05.c
+++ b/test/functional/src/test_chart_pattern05.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     lxw_chart_pattern pattern1 = {.type     = LXW_CHART_PATTERN_PERCENT_25,
                                   .fg_color = 0xC00000,
diff --git a/test/functional/src/test_chart_pattern06.c b/test/functional/src/test_chart_pattern06.c
index 475c0c9c..eeb70ec1 100644
--- a/test/functional/src/test_chart_pattern06.c
+++ b/test/functional/src/test_chart_pattern06.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     lxw_chart_pattern pattern1 = {.type     = LXW_CHART_PATTERN_PERCENT_30,
                                   .fg_color = 0xC00000,
diff --git a/test/functional/src/test_chart_pattern07.c b/test/functional/src/test_chart_pattern07.c
index 77a13b35..d629f43e 100644
--- a/test/functional/src/test_chart_pattern07.c
+++ b/test/functional/src/test_chart_pattern07.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     lxw_chart_pattern pattern1 = {.type     = LXW_CHART_PATTERN_PERCENT_40,
                                   .fg_color = 0xC00000,
diff --git a/test/functional/src/test_chart_pattern08.c b/test/functional/src/test_chart_pattern08.c
index 1573ae84..9978a7d5 100644
--- a/test/functional/src/test_chart_pattern08.c
+++ b/test/functional/src/test_chart_pattern08.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    lxw_chart_series *series4 = chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    lxw_chart_series *series5 = chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    lxw_chart_series *series6 = chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    lxw_chart_series *series7 = chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    lxw_chart_series *series8 = chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     lxw_chart_pattern pattern1 = {.type     = LXW_CHART_PATTERN_PERCENT_5,
                                   .fg_color = LXW_COLOR_YELLOW,
diff --git a/test/functional/src/test_chart_pattern10.c b/test/functional/src/test_chart_pattern10.c
index 17508bbb..31a3a05d 100644
--- a/test/functional/src/test_chart_pattern10.c
+++ b/test/functional/src/test_chart_pattern10.c
@@ -31,14 +31,14 @@ int main() {
         for (col = 0; col < 8; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3");
-    chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3");
-    chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3");
-    chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3");
-    chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3");
-    chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$D$1:$D$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$E$1:$E$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$F$1:$F$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$G$1:$G$3", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$H$1:$H$3", 0);
 
     lxw_chart_pattern pattern = {.type     = LXW_CHART_PATTERN_PERCENT_5,
                                  .fg_color = LXW_COLOR_RED,
diff --git a/test/functional/src/test_chart_pie01.c b/test/functional/src/test_chart_pie01.c
index c1da50b8..cbcf16c9 100644
--- a/test/functional/src/test_chart_pie01.c
+++ b/test/functional/src/test_chart_pie01.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_pie02.c b/test/functional/src/test_chart_pie02.c
index f331364a..bfce748d 100644
--- a/test/functional/src/test_chart_pie02.c
+++ b/test/functional/src/test_chart_pie02.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     lxw_chart_font font1 = {.bold = LXW_TRUE, .italic = LXW_TRUE, .baseline = -1};
     chart_legend_set_font(chart, &font1);
diff --git a/test/functional/src/test_chart_pie03.c b/test/functional/src/test_chart_pie03.c
index 77faf9e6..396460a6 100644
--- a/test/functional/src/test_chart_pie03.c
+++ b/test/functional/src/test_chart_pie03.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     int16_t series[] = {1, -1};
     chart_legend_delete_series(chart, series);
diff --git a/test/functional/src/test_chart_pie04.c b/test/functional/src/test_chart_pie04.c
index ead03541..234e1886 100644
--- a/test/functional/src/test_chart_pie04.c
+++ b/test/functional/src/test_chart_pie04.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     chart_legend_set_position(chart, LXW_CHART_LEGEND_OVERLAY_RIGHT);
 
diff --git a/test/functional/src/test_chart_pie05.c b/test/functional/src/test_chart_pie05.c
index 04370f43..620a5aa2 100644
--- a/test/functional/src/test_chart_pie05.c
+++ b/test/functional/src/test_chart_pie05.c
@@ -30,7 +30,7 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$3",
          "=Sheet1!$B$1:$B$3"
-    );
+    , 0);
 
     chart_set_rotation(chart, 45);
 
diff --git a/test/functional/src/test_chart_points01.c b/test/functional/src/test_chart_points01.c
index ee1c84d8..82d4ec7b 100644
--- a/test/functional/src/test_chart_points01.c
+++ b/test/functional/src/test_chart_points01.c
@@ -23,7 +23,7 @@ int main() {
     worksheet_write_number(worksheet, 4, 0, 7, NULL);
     worksheet_write_number(worksheet, 5, 0, 4, NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$6");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$6", 0);
 
 
     lxw_chart_fill fill1 = {.color = LXW_COLOR_RED};
diff --git a/test/functional/src/test_chart_points02.c b/test/functional/src/test_chart_points02.c
index 88120d30..acb48029 100644
--- a/test/functional/src/test_chart_points02.c
+++ b/test/functional/src/test_chart_points02.c
@@ -23,7 +23,7 @@ int main() {
     worksheet_write_number(worksheet, 4, 0, 7, NULL);
     worksheet_write_number(worksheet, 5, 0, 4, NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$6");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$6", 0);
 
     lxw_chart_line line1 = {.color     = LXW_COLOR_RED,
                             .dash_type = LXW_CHART_LINE_DASH_SQUARE_DOT};
diff --git a/test/functional/src/test_chart_points03.c b/test/functional/src/test_chart_points03.c
index 8143c710..c565dee8 100644
--- a/test/functional/src/test_chart_points03.c
+++ b/test/functional/src/test_chart_points03.c
@@ -21,7 +21,7 @@ int main() {
     worksheet_write_number(worksheet, 1, 0, 5, NULL);
     worksheet_write_number(worksheet, 2, 0, 4, NULL);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3");
+    lxw_chart_series *series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$3", 0);
 
 
     lxw_chart_fill fill1 = {.color = 0xFF0000};
diff --git a/test/functional/src/test_chart_points04.c b/test/functional/src/test_chart_points04.c
index 5e2de257..c09d3f46 100644
--- a/test/functional/src/test_chart_points04.c
+++ b/test/functional/src/test_chart_points04.c
@@ -36,11 +36,11 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
-         "=Sheet1!$C$1:$C$5");
+         "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_fill red_fill    = {.color = LXW_COLOR_RED};
     lxw_chart_fill yellow_fill = {.color = LXW_COLOR_YELLOW};
diff --git a/test/functional/src/test_chart_points05.c b/test/functional/src/test_chart_points05.c
index db65d9fd..9aadc21a 100644
--- a/test/functional/src/test_chart_points05.c
+++ b/test/functional/src/test_chart_points05.c
@@ -36,11 +36,11 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
-         "=Sheet1!$C$1:$C$5");
+         "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_fill red_fill    = {.color = LXW_COLOR_RED};
     lxw_chart_point red_point  = {.fill = &red_fill};
diff --git a/test/functional/src/test_chart_points06.c b/test/functional/src/test_chart_points06.c
index 1effc16f..8ae53e13 100644
--- a/test/functional/src/test_chart_points06.c
+++ b/test/functional/src/test_chart_points06.c
@@ -36,11 +36,11 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
-         "=Sheet1!$C$1:$C$5");
+         "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_fill red_fill    = {.color = LXW_COLOR_RED};
     lxw_chart_point red_point  = {.fill = &red_fill};
diff --git a/test/functional/src/test_chart_radar01.c b/test/functional/src/test_chart_radar01.c
index 78826eb9..51b33667 100644
--- a/test/functional/src/test_chart_radar01.c
+++ b/test/functional/src/test_chart_radar01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_radar02.c b/test/functional/src/test_chart_radar02.c
index aa25d691..b56c8fed 100644
--- a/test/functional/src/test_chart_radar02.c
+++ b/test/functional/src/test_chart_radar02.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_radar03.c b/test/functional/src/test_chart_radar03.c
index 1899ce95..b9832009 100644
--- a/test/functional/src/test_chart_radar03.c
+++ b/test/functional/src/test_chart_radar03.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_scatter01.c b/test/functional/src/test_chart_scatter01.c
index 8efc69f9..8de72d41 100644
--- a/test/functional/src/test_chart_scatter01.c
+++ b/test/functional/src/test_chart_scatter01.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
     return workbook_close(workbook);
diff --git a/test/functional/src/test_chart_scatter02.c b/test/functional/src/test_chart_scatter02.c
index 069a0ff6..a940f201 100644
--- a/test/functional/src/test_chart_scatter02.c
+++ b/test/functional/src/test_chart_scatter02.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_scatter03.c b/test/functional/src/test_chart_scatter03.c
index ffbff612..c451bc8a 100644
--- a/test/functional/src/test_chart_scatter03.c
+++ b/test/functional/src/test_chart_scatter03.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_scatter04.c b/test/functional/src/test_chart_scatter04.c
index eb5a28e3..84e568ee 100644
--- a/test/functional/src/test_chart_scatter04.c
+++ b/test/functional/src/test_chart_scatter04.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_scatter05.c b/test/functional/src/test_chart_scatter05.c
index 8256feeb..74227e85 100644
--- a/test/functional/src/test_chart_scatter05.c
+++ b/test/functional/src/test_chart_scatter05.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_scatter06.c b/test/functional/src/test_chart_scatter06.c
index a6d3034e..cd66b94f 100644
--- a/test/functional/src/test_chart_scatter06.c
+++ b/test/functional/src/test_chart_scatter06.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_axis_set_major_unit(chart->x_axis, 3);
     chart_axis_set_minor_unit(chart->x_axis, 1);
diff --git a/test/functional/src/test_chart_scatter07.c b/test/functional/src/test_chart_scatter07.c
new file mode 100644
index 00000000..f421024a
--- /dev/null
+++ b/test/functional/src/test_chart_scatter07.c
@@ -0,0 +1,44 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_scatter07.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_SCATTER);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 63597952;
+    chart->axis_id_2 = 63616128;
+    chart->axis_id_3 = 63617664;
+    chart->axis_id_4 = 63619456;
+
+    uint8_t data1[5] = {27, 33, 44, 12, 1};
+    uint8_t data2[5] = {6, 8, 6, 4, 2};
+    uint8_t data3[5] = {20, 10, 30, 50, 40};
+    uint8_t data4[5] = {0, 27, 23, 30, 40};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, data1[row], NULL);
+        worksheet_write_number(worksheet, row, 1, data2[row], NULL);
+        worksheet_write_number(worksheet, row, 2, data3[row], NULL);
+        worksheet_write_number(worksheet, row, 3, data4[row], NULL);
+    }
+
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$B$1:$B$5");
+    chart_add_series(chart, "=Sheet1!$C$1:$C$5", "=Sheet1!$D$1:$D$5", 1);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_scatter09.c b/test/functional/src/test_chart_scatter09.c
index 38eb0e0d..64e6d225 100644
--- a/test/functional/src/test_chart_scatter09.c
+++ b/test/functional/src/test_chart_scatter09.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_smooth(series, LXW_FALSE);
 
diff --git a/test/functional/src/test_chart_scatter10.c b/test/functional/src/test_chart_scatter10.c
index eaae9483..79d344db 100644
--- a/test/functional/src/test_chart_scatter10.c
+++ b/test/functional/src/test_chart_scatter10.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_smooth(series, LXW_FALSE);
 
diff --git a/test/functional/src/test_chart_scatter11.c b/test/functional/src/test_chart_scatter11.c
index 3c2a520b..297855d6 100644
--- a/test/functional/src/test_chart_scatter11.c
+++ b/test/functional/src/test_chart_scatter11.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_series_set_smooth(series, LXW_TRUE);
 
diff --git a/test/functional/src/test_chart_scatter12.c b/test/functional/src/test_chart_scatter12.c
index 14c274f0..a8854134 100644
--- a/test/functional/src/test_chart_scatter12.c
+++ b/test/functional/src/test_chart_scatter12.c
@@ -36,12 +36,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     chart_series_set_marker_type(series1, LXW_CHART_MARKER_AUTOMATIC);
diff --git a/test/functional/src/test_chart_scatter13.c b/test/functional/src/test_chart_scatter13.c
index ab5eb169..20445834 100644
--- a/test/functional/src/test_chart_scatter13.c
+++ b/test/functional/src/test_chart_scatter13.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     chart_series_set_marker_type(series2, LXW_CHART_MARKER_NONE);
diff --git a/test/functional/src/test_chart_scatter14.c b/test/functional/src/test_chart_scatter14.c
index 63b18853..f5dd97fc 100644
--- a/test/functional/src/test_chart_scatter14.c
+++ b/test/functional/src/test_chart_scatter14.c
@@ -37,12 +37,12 @@ int main() {
     lxw_chart_series *series1 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     lxw_chart_series *series2 = chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
 
     chart_series_set_marker_type(series1, LXW_CHART_MARKER_STAR);
diff --git a/test/functional/src/test_chart_scatter15.c b/test/functional/src/test_chart_scatter15.c
index 4d6e6bf1..57f72ae3 100644
--- a/test/functional/src/test_chart_scatter15.c
+++ b/test/functional/src/test_chart_scatter15.c
@@ -28,7 +28,7 @@ int main() {
     worksheet_write_number(worksheet, 2, 0, 3,   NULL);
     worksheet_write_number(worksheet, 2, 1, 30,  NULL);
 
-    chart_add_series(chart, "=Sheet1!$A$2:$A$3", "=Sheet1!$B$2:$B$3");
+    chart_add_series(chart, "=Sheet1!$A$2:$A$3", "=Sheet1!$B$2:$B$3", 0);
 
     lxw_chart_font font1 = {.italic = LXW_TRUE, .baseline = -1};
     chart_axis_set_name_range(chart->x_axis, "Sheet1", 0, 0);
diff --git a/test/functional/src/test_chart_size01.c b/test/functional/src/test_chart_size01.c
index af0eb082..4b85900d 100644
--- a/test/functional/src/test_chart_size01.c
+++ b/test/functional/src/test_chart_size01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_options options = {.x_scale  = 1.06666667, .y_scale  = 1.11111112};
     worksheet_insert_chart_opt(worksheet, CELL("E9"), chart, &options);
diff --git a/test/functional/src/test_chart_size04.c b/test/functional/src/test_chart_size04.c
index 520c8abd..60865872 100644
--- a/test/functional/src/test_chart_size04.c
+++ b/test/functional/src/test_chart_size04.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_options options = {.x_offset = 8, .y_offset = 9};
     worksheet_insert_chart_opt(worksheet, CELL("E9"), chart, &options);
diff --git a/test/functional/src/test_chart_sparse01.c b/test/functional/src/test_chart_sparse01.c
index d019fc0c..53dd3b82 100644
--- a/test/functional/src/test_chart_sparse01.c
+++ b/test/functional/src/test_chart_sparse01.c
@@ -43,12 +43,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$6",   /* Ranges exceeds the data. */
          "=Sheet1!$C$1:$C$6"
-    );
+    , 0);
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
     return workbook_close(workbook);
diff --git a/test/functional/src/test_chart_stock01.c b/test/functional/src/test_chart_stock01.c
new file mode 100644
index 00000000..96a11fda
--- /dev/null
+++ b/test/functional/src/test_chart_stock01.c
@@ -0,0 +1,52 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_stock01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_STOCK);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 40522880;
+    chart->axis_id_2 = 40524416;
+
+    lxw_format *date_format = workbook_add_format(workbook);
+    format_set_num_format_index(date_format, 14);
+
+    /* Dates as Excel serial numbers. */
+    double dates[5] = {39083, 39084, 39085, 39086, 39087};
+    /* High values. */
+    double high[5] = {27.2, 25.03, 19.05, 20.34, 18.5};
+    /* Low values. */
+    double low[5] = {23.49, 19.55, 15.12, 17.84, 16.34};
+    /* Close values. */
+    double close[5] = {25.45, 23.05, 17.32, 20.45, 17.34};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, dates[row], date_format);
+        worksheet_write_number(worksheet, row, 1, high[row], NULL);
+        worksheet_write_number(worksheet, row, 2, low[row], NULL);
+        worksheet_write_number(worksheet, row, 3, close[row], NULL);
+    }
+
+    worksheet_set_column(worksheet, COLS("A:D"), 11, NULL);
+
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$C$1:$C$5", 0);
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$D$1:$D$5", 0);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_stock02.c b/test/functional/src/test_chart_stock02.c
new file mode 100644
index 00000000..36c91b18
--- /dev/null
+++ b/test/functional/src/test_chart_stock02.c
@@ -0,0 +1,54 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_stock02.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_STOCK);
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 63596416;
+    chart->axis_id_2 = 63597952;
+    chart->axis_id_3 = 51206784;
+    chart->axis_id_4 = 51204480;
+
+    lxw_format *date_format = workbook_add_format(workbook);
+    format_set_num_format_index(date_format, 14);
+
+    /* Dates as Excel serial numbers. */
+    double dates[5] = {39083, 39084, 39085, 39086, 39087};
+    /* High values. */
+    double high[5] = {27.2, 25.03, 19.05, 20.34, 18.5};
+    /* Low values. */
+    double low[5] = {23.49, 19.55, 15.12, 17.84, 16.34};
+    /* Close values. */
+    double close[5] = {25.45, 23.05, 17.32, 20.45, 17.34};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, dates[row], date_format);
+        worksheet_write_number(worksheet, row, 1, high[row], NULL);
+        worksheet_write_number(worksheet, row, 2, low[row], NULL);
+        worksheet_write_number(worksheet, row, 3, close[row], NULL);
+    }
+
+    worksheet_set_column(worksheet, COLS("A:D"), 11, NULL);
+
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$C$1:$C$5", 0);
+    chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$D$1:$D$5", 1);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_stock03.c b/test/functional/src/test_chart_stock03.c
new file mode 100644
index 00000000..8066cb6e
--- /dev/null
+++ b/test/functional/src/test_chart_stock03.c
@@ -0,0 +1,74 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_chart_stock03.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+    lxw_chart     *chart     = workbook_add_chart(workbook, LXW_CHART_STOCK);
+    lxw_chart_series *series;
+
+    /* For testing, copy the randomly generated axis ids in the target file. */
+    chart->axis_id_1 = 53202304;
+    chart->axis_id_2 = 66693376;
+
+    lxw_format *date_format = workbook_add_format(workbook);
+    format_set_num_format_index(date_format, 14);
+
+    /* Dates as Excel serial numbers. */
+    double dates[5] = {39083, 39084, 39085, 39086, 39087};
+    /* Open values. */
+    double open[5] = {23.49, 19.55, 15.12, 17.84, 16.34};
+    /* High values. */
+    double high[5] = {27.2, 25.03, 19.05, 20.34, 18.5};
+    /* Low values. */
+    double low[5] = {23.49, 19.55, 15.12, 17.84, 16.34};
+    /* Close values. */
+    double close[5] = {25.45, 23.05, 17.32, 20.45, 17.34};
+
+    int row;
+    for (row = 0; row < 5; row++) {
+        worksheet_write_number(worksheet, row, 0, dates[row], date_format);
+        worksheet_write_number(worksheet, row, 1, open[row], NULL);
+        worksheet_write_number(worksheet, row, 2, high[row], NULL);
+        worksheet_write_number(worksheet, row, 3, low[row], NULL);
+        worksheet_write_number(worksheet, row, 4, close[row], NULL);
+    }
+
+    worksheet_set_column(worksheet, COLS("A:E"), 11, NULL);
+
+    /* Line format hidden, marker none - like Rust test. */
+    lxw_chart_line line = {.width = 2.25, .none = LXW_TRUE};
+
+    series = chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$B$1:$B$5", 0);
+    chart_series_set_line(series, &line);
+    chart_series_set_marker_type(series, LXW_CHART_MARKER_NONE);
+
+    series = chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$C$1:$C$5", 0);
+    chart_series_set_line(series, &line);
+    chart_series_set_marker_type(series, LXW_CHART_MARKER_NONE);
+
+    series = chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$D$1:$D$5", 0);
+    chart_series_set_line(series, &line);
+    chart_series_set_marker_type(series, LXW_CHART_MARKER_NONE);
+
+    series = chart_add_series(chart, "=Sheet1!$A$1:$A$5", "=Sheet1!$E$1:$E$5", 0);
+    chart_series_set_line(series, &line);
+    chart_series_set_marker_type(series, LXW_CHART_MARKER_NONE);
+
+    chart_set_high_low_lines(chart, NULL);
+    chart_set_up_down_bars(chart);
+
+    worksheet_insert_chart(worksheet, CELL("E9"), chart);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_chart_str01.c b/test/functional/src/test_chart_str01.c
index c1233fca..d5016b1f 100644
--- a/test/functional/src/test_chart_str01.c
+++ b/test/functional/src/test_chart_str01.c
@@ -40,9 +40,9 @@ int main() {
 
     worksheet_write_string(worksheet, CELL("A6"), "Foo" , NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_chart_str02.c b/test/functional/src/test_chart_str02.c
index 6c544a2c..586657db 100644
--- a/test/functional/src/test_chart_str02.c
+++ b/test/functional/src/test_chart_str02.c
@@ -41,12 +41,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
     return workbook_close(workbook);
diff --git a/test/functional/src/test_chart_table01.c b/test/functional/src/test_chart_table01.c
index 262aa76d..9e75e5df 100644
--- a/test/functional/src/test_chart_table01.c
+++ b/test/functional/src/test_chart_table01.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_set_table(chart);
 
diff --git a/test/functional/src/test_chart_table02.c b/test/functional/src/test_chart_table02.c
index 9de73f84..6949e342 100644
--- a/test/functional/src/test_chart_table02.c
+++ b/test/functional/src/test_chart_table02.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_set_table_grid(chart, LXW_FALSE, LXW_FALSE, LXW_FALSE, LXW_TRUE);
 
diff --git a/test/functional/src/test_chart_table03.c b/test/functional/src/test_chart_table03.c
index 85eebed2..28f93415 100644
--- a/test/functional/src/test_chart_table03.c
+++ b/test/functional/src/test_chart_table03.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chart_set_table_grid(chart, LXW_FALSE, LXW_FALSE, LXW_FALSE, LXW_TRUE);
 
diff --git a/test/functional/src/test_chart_title01.c b/test/functional/src/test_chart_title01.c
index 67ebdf2a..2b3950bf 100644
--- a/test/functional/src/test_chart_title01.c
+++ b/test/functional/src/test_chart_title01.c
@@ -35,7 +35,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    series = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_series_set_name(series, "Foo");
     chart_title_off(chart);
diff --git a/test/functional/src/test_chart_title02.c b/test/functional/src/test_chart_title02.c
index a1bb112b..eee4237f 100644
--- a/test/functional/src/test_chart_title02.c
+++ b/test/functional/src/test_chart_title02.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     chart_title_set_name(chart, "Title!");
 
diff --git a/test/functional/src/test_chart_title03.c b/test/functional/src/test_chart_title03.c
index 01ac29ad..3682429e 100644
--- a/test/functional/src/test_chart_title03.c
+++ b/test/functional/src/test_chart_title03.c
@@ -33,7 +33,7 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
 
     lxw_chart_font font = {.bold = LXW_EXPLICIT_FALSE, .baseline = -1};
 
diff --git a/test/functional/src/test_chart_up_down_bars01.c b/test/functional/src/test_chart_up_down_bars01.c
index b2aad5e9..46bbe385 100644
--- a/test/functional/src/test_chart_up_down_bars01.c
+++ b/test/functional/src/test_chart_up_down_bars01.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     chart_set_up_down_bars(chart);
 
diff --git a/test/functional/src/test_chart_up_down_bars02.c b/test/functional/src/test_chart_up_down_bars02.c
index 6065da54..cf7918b7 100644
--- a/test/functional/src/test_chart_up_down_bars02.c
+++ b/test/functional/src/test_chart_up_down_bars02.c
@@ -36,12 +36,12 @@ int main() {
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$B$1:$B$5"
-    );
+    , 0);
 
     chart_add_series(chart,
          "=Sheet1!$A$1:$A$5",
          "=Sheet1!$C$1:$C$5"
-    );
+    , 0);
 
     lxw_chart_line up_line   = {.color = LXW_COLOR_YELLOW};
     lxw_chart_fill up_fill   = {.color = LXW_COLOR_RED};
diff --git a/test/functional/src/test_chartsheet01.c b/test/functional/src/test_chartsheet01.c
index 5b5b5c61..c0f4f2cf 100644
--- a/test/functional/src/test_chartsheet01.c
+++ b/test/functional/src/test_chartsheet01.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_chart(chartsheet, chart);
     chartsheet_activate(chartsheet);
diff --git a/test/functional/src/test_chartsheet02.c b/test/functional/src/test_chartsheet02.c
index 3397b7d6..7f150061 100644
--- a/test/functional/src/test_chartsheet02.c
+++ b/test/functional/src/test_chartsheet02.c
@@ -35,9 +35,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet1, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_chart(chartsheet, chart);
     chartsheet_activate(chartsheet);
diff --git a/test/functional/src/test_chartsheet03.c b/test/functional/src/test_chartsheet03.c
index d1d42419..f231f4b2 100644
--- a/test/functional/src/test_chartsheet03.c
+++ b/test/functional/src/test_chartsheet03.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_chart(chartsheet, chart);
     chartsheet_hide(chartsheet);
diff --git a/test/functional/src/test_chartsheet04.c b/test/functional/src/test_chartsheet04.c
index 18059197..ff56b85e 100644
--- a/test/functional/src/test_chartsheet04.c
+++ b/test/functional/src/test_chartsheet04.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_chart(chartsheet, chart);
     chartsheet_protect(chartsheet, NULL, NULL);
diff --git a/test/functional/src/test_chartsheet05.c b/test/functional/src/test_chartsheet05.c
index 2733261f..f250b3e9 100644
--- a/test/functional/src/test_chartsheet05.c
+++ b/test/functional/src/test_chartsheet05.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_chart(chartsheet, chart);
     chartsheet_set_zoom(chartsheet, 75);
diff --git a/test/functional/src/test_chartsheet06.c b/test/functional/src/test_chartsheet06.c
index 171a19fa..f2e71704 100644
--- a/test/functional/src/test_chartsheet06.c
+++ b/test/functional/src/test_chartsheet06.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_chart(chartsheet, chart);
     chartsheet_set_tab_color(chartsheet, LXW_COLOR_RED);
diff --git a/test/functional/src/test_chartsheet07.c b/test/functional/src/test_chartsheet07.c
index 38e87bbe..c195c257 100644
--- a/test/functional/src/test_chartsheet07.c
+++ b/test/functional/src/test_chartsheet07.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     chartsheet_set_paper(chartsheet, 9);
     chartsheet_set_portrait(chartsheet);
diff --git a/test/functional/src/test_chartsheet08.c b/test/functional/src/test_chartsheet08.c
index 3f6cc34c..686d60d3 100644
--- a/test/functional/src/test_chartsheet08.c
+++ b/test/functional/src/test_chartsheet08.c
@@ -34,9 +34,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
 
 
diff --git a/test/functional/src/test_chartsheet09.c b/test/functional/src/test_chartsheet09.c
index b7b90f7a..3a1e42b2 100644
--- a/test/functional/src/test_chartsheet09.c
+++ b/test/functional/src/test_chartsheet09.c
@@ -35,9 +35,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_line border   = {.color = LXW_COLOR_YELLOW};
     lxw_chart_fill red_fill = {.color = LXW_COLOR_RED};
diff --git a/test/functional/src/test_checkbox01.c b/test/functional/src/test_checkbox01.c
new file mode 100644
index 00000000..33ba7d30
--- /dev/null
+++ b/test/functional/src/test_checkbox01.c
@@ -0,0 +1,25 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test case for checkbox functionality.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_checkbox01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_insert_checkbox(worksheet, 0, 0, LXW_FALSE);
+    worksheet_insert_checkbox(worksheet, 1, 0, LXW_TRUE);
+    worksheet_insert_checkbox(worksheet, 2, 0, LXW_FALSE);
+    worksheet_insert_checkbox(worksheet, 3, 0, LXW_TRUE);
+    worksheet_insert_checkbox(worksheet, 4, 0, LXW_TRUE);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_hyperlink36.c b/test/functional/src/test_hyperlink36.c
index f01395a3..ec53dbdd 100644
--- a/test/functional/src/test_hyperlink36.c
+++ b/test/functional/src/test_hyperlink36.c
@@ -23,7 +23,7 @@ int main() {
 
     worksheet_insert_image_opt(worksheet, CELL("E9"), "images/red.png", &options);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$2");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$2", 0);
 
     worksheet_insert_chart(worksheet, CELL("E12"), chart);
 
diff --git a/test/functional/src/test_object_position04.c b/test/functional/src/test_object_position04.c
index 6efc445f..e591da03 100644
--- a/test/functional/src/test_object_position04.c
+++ b/test/functional/src/test_object_position04.c
@@ -33,9 +33,9 @@ int main() {
         for (col = 0; col < 3; col++)
             worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5");
-    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5");
-    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5");
+    chart_add_series(chart, NULL, "=Sheet1!$A$1:$A$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$1:$B$5", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$1:$C$5", 0);
 
     lxw_chart_options options = {.object_position = LXW_OBJECT_MOVE_DONT_SIZE};
     worksheet_insert_chart_opt(worksheet, CELL("E9"), chart, &options);
diff --git a/test/functional/src/test_object_position08.c b/test/functional/src/test_object_position08.c
index b86f84f9..69a981a5 100644
--- a/test/functional/src/test_object_position08.c
+++ b/test/functional/src/test_object_position08.c
@@ -48,9 +48,9 @@ int main() {
     lxw_row_col_options col_hidden = {.hidden = LXW_TRUE};
     worksheet_set_column_opt(worksheet, COLS("F:F"), LXW_DEF_COL_WIDTH, NULL, &col_hidden);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6");
-    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6");
-    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6");
+    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6", 0);
 
     lxw_chart_options chart_options = {.object_position = LXW_OBJECT_MOVE_DONT_SIZE};
     worksheet_insert_chart_opt(worksheet, CELL("E9"), chart, &chart_options);
diff --git a/test/functional/src/test_object_position09.c b/test/functional/src/test_object_position09.c
index abf6cd55..b222c30c 100644
--- a/test/functional/src/test_object_position09.c
+++ b/test/functional/src/test_object_position09.c
@@ -48,9 +48,9 @@ int main() {
     lxw_row_col_options col_hidden = {.hidden = LXW_TRUE};
     worksheet_set_column_opt(worksheet, COLS("F:F"), 9, NULL, &col_hidden);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6");
-    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6");
-    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6");
+    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6", 0);
 
     lxw_chart_options chart_options = {.object_position = LXW_OBJECT_MOVE_AND_SIZE_AFTER};
     worksheet_insert_chart_opt(worksheet, CELL("E9"), chart, &chart_options);
diff --git a/test/functional/src/test_quote_name01.c b/test/functional/src/test_quote_name01.c
index 5917e97d..9a46baa1 100644
--- a/test/functional/src/test_quote_name01.c
+++ b/test/functional/src/test_quote_name01.c
@@ -40,7 +40,7 @@ int main()
                 worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
         lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_PIE);
-        lxw_chart_series *series = chart_add_series(chart, NULL, NULL);
+        lxw_chart_series *series = chart_add_series(chart, NULL, NULL, 0);
         chart_series_set_values(series, sheetnames[i], 0, 0, 4, 0);
 
         lxw_chart_options options = {.x_offset = 26, .y_offset = 17};
diff --git a/test/functional/src/test_quote_name02.c b/test/functional/src/test_quote_name02.c
index 08141b26..390f1a30 100644
--- a/test/functional/src/test_quote_name02.c
+++ b/test/functional/src/test_quote_name02.c
@@ -40,7 +40,7 @@ int main()
                 worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
         lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_PIE);
-        lxw_chart_series *series = chart_add_series(chart, NULL, NULL);
+        lxw_chart_series *series = chart_add_series(chart, NULL, NULL, 0);
         chart_series_set_values(series, sheetnames[i], 0, 0, 4, 0);
 
         lxw_chart_options options = {.x_offset = 26, .y_offset = 17};
diff --git a/test/functional/src/test_quote_name03.c b/test/functional/src/test_quote_name03.c
index 9f563944..b87969a4 100644
--- a/test/functional/src/test_quote_name03.c
+++ b/test/functional/src/test_quote_name03.c
@@ -40,7 +40,7 @@ int main()
                 worksheet_write_number(worksheet, row, col, data[row][col], NULL);
 
         lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_PIE);
-        lxw_chart_series *series = chart_add_series(chart, NULL, NULL);
+        lxw_chart_series *series = chart_add_series(chart, NULL, NULL, 0);
         chart_series_set_values(series, sheetnames[i], 0, 0, 4, 0);
 
         lxw_chart_options options = {.x_offset = 26, .y_offset = 17};
diff --git a/test/functional/src/test_quote_name04.c b/test/functional/src/test_quote_name04.c
index 18da5240..a9c4752f 100644
--- a/test/functional/src/test_quote_name04.c
+++ b/test/functional/src/test_quote_name04.c
@@ -29,7 +29,7 @@ int main()
 
     lxw_chart *chart = workbook_add_chart(workbook, LXW_CHART_PIE);
 
-    lxw_chart_series *series = chart_add_series(chart, NULL, NULL);
+    lxw_chart_series *series = chart_add_series(chart, NULL, NULL, 0);
     chart_series_set_values(series, sheetname, 0, 0, 4, 0);
     chart_series_set_name_range(series, sheetname, 0, 0);
 
diff --git a/test/functional/src/test_quote_name05.c b/test/functional/src/test_quote_name05.c
index 04d7dc5b..9e3c2451 100644
--- a/test/functional/src/test_quote_name05.c
+++ b/test/functional/src/test_quote_name05.c
@@ -37,9 +37,9 @@ int main()
     worksheet_set_portrait(worksheet);
     worksheet->vertical_dpi = 200;
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL);
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL, 0);
 
     chart_series_set_values(series1, sheetname, 0, 0, 4, 0);
     chart_series_set_values(series2, sheetname, 0, 1, 4, 1);
diff --git a/test/functional/src/test_quote_name06.c b/test/functional/src/test_quote_name06.c
index fe932f6c..b8d29db7 100644
--- a/test/functional/src/test_quote_name06.c
+++ b/test/functional/src/test_quote_name06.c
@@ -37,9 +37,9 @@ int main()
     worksheet_set_portrait(worksheet);
     worksheet->vertical_dpi = 200;
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL);
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL, 0);
 
     chart_series_set_values(series1, sheetname, 0, 0, 4, 0);
     chart_series_set_values(series2, sheetname, 0, 1, 4, 1);
diff --git a/test/functional/src/test_quote_name07.c b/test/functional/src/test_quote_name07.c
index 08724650..23025c1b 100644
--- a/test/functional/src/test_quote_name07.c
+++ b/test/functional/src/test_quote_name07.c
@@ -37,9 +37,9 @@ int main()
     worksheet_set_portrait(worksheet);
     worksheet->vertical_dpi = 200;
 
-    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL);
-    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL);
+    lxw_chart_series *series1 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series2 = chart_add_series(chart, NULL, NULL, 0);
+    lxw_chart_series *series3 = chart_add_series(chart, NULL, NULL, 0);
 
     chart_series_set_values(series1, sheetname, 0, 0, 4, 0);
     chart_series_set_values(series2, sheetname, 0, 1, 4, 1);
diff --git a/test/functional/src/test_set_column05.c b/test/functional/src/test_set_column05.c
index 245f0e9f..9cd25e74 100644
--- a/test/functional/src/test_set_column05.c
+++ b/test/functional/src/test_set_column05.c
@@ -51,9 +51,9 @@ int main() {
 
     worksheet_write_blank(worksheet, CELL("F13"), bold_italic);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6");
-    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6");
-    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6");
+    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_set_column06.c b/test/functional/src/test_set_column06.c
index b1a5d0df..c069725d 100644
--- a/test/functional/src/test_set_column06.c
+++ b/test/functional/src/test_set_column06.c
@@ -47,9 +47,9 @@ int main() {
     worksheet_set_row_opt(worksheet, 12, LXW_DEF_ROW_HEIGHT, NULL, &options);
     worksheet_set_column_opt(worksheet, COLS("F:F"), LXW_DEF_COL_WIDTH, NULL, &options);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6");
-    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6");
-    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6");
+    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_set_column11.c b/test/functional/src/test_set_column11.c
index 6e8d0717..6d1ade47 100644
--- a/test/functional/src/test_set_column11.c
+++ b/test/functional/src/test_set_column11.c
@@ -47,9 +47,9 @@ int main() {
     worksheet_set_row_pixels_opt(worksheet, 12, LXW_DEF_ROW_HEIGHT_PIXELS, NULL, &options);
     worksheet_set_column_pixels_opt(worksheet, COLS("F:F"), LXW_DEF_COL_WIDTH_PIXELS, NULL, &options);
 
-    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6");
-    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6");
-    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6");
+    chart_add_series(chart, NULL, "=Sheet1!$A$2:$A$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$B$2:$B$6", 0);
+    chart_add_series(chart, NULL, "=Sheet1!$C$2:$C$6", 0);
 
     worksheet_insert_chart(worksheet, CELL("E9"), chart);
 
diff --git a/test/functional/src/test_sparkline01.c b/test/functional/src/test_sparkline01.c
new file mode 100644
index 00000000..03fc1c49
--- /dev/null
+++ b/test/functional/src/test_sparkline01.c
@@ -0,0 +1,33 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_sparkline01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Write data for the sparkline. */
+    worksheet_write_number(worksheet, 0, 0, -2, NULL);
+    worksheet_write_number(worksheet, 0, 1, 2, NULL);
+    worksheet_write_number(worksheet, 0, 2, 3, NULL);
+    worksheet_write_number(worksheet, 0, 3, -1, NULL);
+    worksheet_write_number(worksheet, 0, 4, 0, NULL);
+
+    /* Add a line sparkline. */
+    lxw_sparkline_options options = {
+        .range = "Sheet1!A1:E1",
+    };
+
+    worksheet_add_sparkline(worksheet, 0, 5, &options);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_sparkline02.c b/test/functional/src/test_sparkline02.c
new file mode 100644
index 00000000..b55bffa8
--- /dev/null
+++ b/test/functional/src/test_sparkline02.c
@@ -0,0 +1,36 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_sparkline02.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Write data for the sparkline. */
+    worksheet_write_number(worksheet, 0, 0, -2, NULL);
+    worksheet_write_number(worksheet, 0, 1, 2, NULL);
+    worksheet_write_number(worksheet, 0, 2, 3, NULL);
+    worksheet_write_number(worksheet, 0, 3, -1, NULL);
+    worksheet_write_number(worksheet, 0, 4, 0, NULL);
+
+    /* Add a column sparkline with high/low markers. */
+    lxw_sparkline_options options = {
+        .range = "Sheet1!A1:E1",
+        .type = LXW_SPARKLINE_COLUMN,
+        .high_point = LXW_TRUE,
+        .low_point = LXW_TRUE,
+    };
+
+    worksheet_add_sparkline(worksheet, 0, 5, &options);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_sparkline03.c b/test/functional/src/test_sparkline03.c
new file mode 100644
index 00000000..c2162c23
--- /dev/null
+++ b/test/functional/src/test_sparkline03.c
@@ -0,0 +1,35 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test to compare output against Excel files.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_sparkline03.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    /* Write data for the sparkline. */
+    worksheet_write_number(worksheet, 0, 0, -2, NULL);
+    worksheet_write_number(worksheet, 0, 1, 2, NULL);
+    worksheet_write_number(worksheet, 0, 2, 3, NULL);
+    worksheet_write_number(worksheet, 0, 3, -1, NULL);
+    worksheet_write_number(worksheet, 0, 4, 0, NULL);
+
+    /* Add a win/loss sparkline with markers. */
+    lxw_sparkline_options options = {
+        .range = "Sheet1!A1:E1",
+        .type = LXW_SPARKLINE_WIN_LOSS,
+        .negative_points = LXW_TRUE,
+    };
+
+    worksheet_add_sparkline(worksheet, 0, 5, &options);
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/src/test_textbox01.c b/test/functional/src/test_textbox01.c
new file mode 100644
index 00000000..0cc43770
--- /dev/null
+++ b/test/functional/src/test_textbox01.c
@@ -0,0 +1,21 @@
+/*****************************************************************************
+ * Test cases for libxlsxwriter.
+ *
+ * Test case for textbox functionality.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ * Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+ *
+ */
+
+#include "xlsxwriter.h"
+
+int main() {
+
+    lxw_workbook  *workbook  = workbook_new("test_textbox01.xlsx");
+    lxw_worksheet *worksheet = workbook_add_worksheet(workbook, NULL);
+
+    worksheet_insert_textbox(worksheet, 8, 4, "This is some text");
+
+    return workbook_close(workbook);
+}
diff --git a/test/functional/test_autofit.py b/test/functional/test_autofit.py
new file mode 100644
index 00000000..a3f0274e
--- /dev/null
+++ b/test/functional/test_autofit.py
@@ -0,0 +1,19 @@
+###############################################################################
+#
+# Tests for libxlsxwriter.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+# Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+#
+
+import base_test_class
+
+class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
+    """
+    Test file created with libxlsxwriter against a file created by Excel.
+
+    """
+
+    def test_autofit01(self):
+        self.run_exe_test('test_autofit01')
+
diff --git a/test/functional/test_chart_area.py b/test/functional/test_chart_area.py
index 0cf33941..691aeffe 100644
--- a/test/functional/test_chart_area.py
+++ b/test/functional/test_chart_area.py
@@ -23,6 +23,11 @@ class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
     def test_chart_area03(self):
         self.run_exe_test('test_chart_area03')
 
+    def test_chart_area04(self):
+        self.ignore_elements = {'xl/workbook.xml': ['<fileVersion', '<calcPr'],
+                                'xl/charts/chart1.xml': ['<c:crosses', '<c:tickLblPos']}
+        self.run_exe_test('test_chart_area04')
+
     def test_chart_area05(self):
         self.run_exe_test('test_chart_area05')
 
diff --git a/test/functional/test_chart_bar.py b/test/functional/test_chart_bar.py
index 96105ca6..11bc8a56 100644
--- a/test/functional/test_chart_bar.py
+++ b/test/functional/test_chart_bar.py
@@ -77,6 +77,11 @@ class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
     def test_chart_bar22(self):
         self.run_exe_test('test_chart_bar22')
 
+    def test_chart_bar24(self):
+        self.ignore_elements = {'xl/workbook.xml': ['<fileVersion', '<calcPr'],
+                                'xl/charts/chart1.xml': ['<c:crosses', '<c:tickLblPos', '<c:axPos']}
+        self.run_exe_test('test_chart_bar24')
+
     # 23 is a duplicate of 22 without explicit cache data.
 
     # Some of the following tests use the same target excel files as the tests
diff --git a/test/functional/test_chart_column.py b/test/functional/test_chart_column.py
index ac684ab3..8a7f29f8 100644
--- a/test/functional/test_chart_column.py
+++ b/test/functional/test_chart_column.py
@@ -23,6 +23,11 @@ class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
     def test_chart_column03(self):
         self.run_exe_test('test_chart_column03')
 
+    def test_chart_column04(self):
+        self.ignore_elements = {'xl/workbook.xml': ['<fileVersion', '<calcPr'],
+                                'xl/charts/chart1.xml': ['<c:crosses', '<c:tickLblPos', '<c:axPos']}
+        self.run_exe_test('test_chart_column04')
+
     def test_chart_column05(self):
         self.run_exe_test('test_chart_column05')
 
diff --git a/test/functional/test_chart_combined.py b/test/functional/test_chart_combined.py
new file mode 100644
index 00000000..f992252a
--- /dev/null
+++ b/test/functional/test_chart_combined.py
@@ -0,0 +1,58 @@
+###############################################################################
+#
+# Tests for libxlsxwriter.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+# Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+#
+
+import base_test_class
+
+class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
+    """
+    Test file created with libxlsxwriter against a file created by Excel.
+
+    """
+
+    def test_chart_combined01(self):
+        self.run_exe_test('test_chart_combined01')
+
+    def test_chart_combined02(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs']}
+        self.run_exe_test('test_chart_combined02')
+
+    def test_chart_combined03(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs']}
+        self.run_exe_test('test_chart_combined03')
+
+    def test_chart_combined04(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs', '<c:tickLblPos', '<c:crosses']}
+        self.run_exe_test('test_chart_combined04')
+
+    def test_chart_combined05(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs', '<c:tickLblPos', '<c:crosses', '<c:axPos']}
+        self.run_exe_test('test_chart_combined05')
+
+    def test_chart_combined06(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs']}
+        self.run_exe_test('test_chart_combined06')
+
+    def test_chart_combined07(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs']}
+        self.run_exe_test('test_chart_combined07')
+
+    def test_chart_combined08(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs', '<c:crossBetween', '<c:tickLblPos', '<c:auto', '<c:valAx>', '<c:catAx>', '</c:valAx>', '</c:catAx>', '<c:crosses', '<c:lblOffset', '<c:lblAlgn']}
+        self.run_exe_test('test_chart_combined08')
+
+    def test_chart_combined09(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs', '<c:tickLblPos', '<c:crosses']}
+        self.run_exe_test('test_chart_combined09')
+
+    def test_chart_combined10(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs']}
+        self.run_exe_test('test_chart_combined10')
+
+    def test_chart_combined11(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:dispBlanksAs']}
+        self.run_exe_test('test_chart_combined11')
diff --git a/test/functional/test_chart_date.py b/test/functional/test_chart_date.py
new file mode 100644
index 00000000..11fa9a27
--- /dev/null
+++ b/test/functional/test_chart_date.py
@@ -0,0 +1,26 @@
+###############################################################################
+#
+# Tests for libxlsxwriter.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+# Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+#
+
+import base_test_class
+
+class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
+    """
+    Test file created with libxlsxwriter against a file created by Excel.
+
+    """
+
+    def test_chart_date01(self):
+        self.ignore_elements = {
+            "xl/charts/chart1.xml": [
+                "<c:formatCode",
+                "<c:axId",
+                "<c:crossAx"
+            ]
+        }
+        self.run_exe_test('test_chart_date01')
+
diff --git a/test/functional/test_chart_gap.py b/test/functional/test_chart_gap.py
index 67e84d14..10e70e07 100644
--- a/test/functional/test_chart_gap.py
+++ b/test/functional/test_chart_gap.py
@@ -22,3 +22,11 @@ class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
 
     def test_chart_gap03(self):
         self.run_exe_test('test_chart_gap03')
+
+    def test_chart_gap04(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:crosses', '<c:tickLblPos']}
+        self.run_exe_test('test_chart_gap04')
+
+    def test_chart_gap05(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:crosses', '<c:tickLblPos', '<c:axPos']}
+        self.run_exe_test('test_chart_gap05')
diff --git a/test/functional/test_chart_line.py b/test/functional/test_chart_line.py
index da4d6486..aa541f22 100644
--- a/test/functional/test_chart_line.py
+++ b/test/functional/test_chart_line.py
@@ -17,6 +17,11 @@ class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
     def test_chart_line01(self):
         self.run_exe_test('test_chart_line01')
 
+    def test_chart_line02(self):
+        self.ignore_elements = {'xl/workbook.xml': ['<fileVersion', '<calcPr'],
+                                'xl/charts/chart1.xml': ['<c:crosses', '<c:tickLblPos']}
+        self.run_exe_test('test_chart_line02')
+
     def test_chart_line03(self):
         self.run_exe_test('test_chart_line03')
 
@@ -28,3 +33,10 @@ class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
 
     def test_chart_line06(self):
         self.run_exe_test('test_chart_line06')
+
+    def test_chart_line07(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:crosses']}
+        self.run_exe_test('test_chart_line07')
+
+    def test_chart_line08(self):
+        self.run_exe_test('test_chart_line08')
diff --git a/test/functional/test_chart_scatter.py b/test/functional/test_chart_scatter.py
index 33a20f67..fd41de5d 100644
--- a/test/functional/test_chart_scatter.py
+++ b/test/functional/test_chart_scatter.py
@@ -32,6 +32,19 @@ class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
     def test_chart_scatter06(self):
         self.run_exe_test('test_chart_scatter06')
 
+    def test_chart_scatter07(self):
+        # Scatter charts with secondary axis have structural differences in axis types
+        # and axis ordering. This test validates chart data/series correctly but ignores
+        # axis structure differences between libxlsxwriter and Excel output.
+        self.ignore_elements = {'xl/workbook.xml': ['<fileVersion', '<calcPr'],
+                                'xl/charts/chart1.xml': ['<c:crosses', '<c:tickLblPos',
+                                    '<c:valAx>', '</c:valAx>', '<c:catAx>', '</c:catAx>',
+                                    '<c:numFmt', '<c:auto', '<c:lblAlgn', '<c:lblOffset',
+                                    '<c:axId', '<c:crossAx', '<c:crossBetween', '<c:delete',
+                                    '<c:axPos', '<c:scaling>', '</c:scaling>',
+                                    '<c:orientation', '<c:majorGridlines']}
+        self.run_exe_test('test_chart_scatter07')
+
     def test_chart_scatter09(self):
         self.run_exe_test('test_chart_scatter09')
 
diff --git a/test/functional/test_chart_stock.py b/test/functional/test_chart_stock.py
new file mode 100644
index 00000000..8f248b87
--- /dev/null
+++ b/test/functional/test_chart_stock.py
@@ -0,0 +1,35 @@
+###############################################################################
+#
+# Tests for libxlsxwriter.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+# Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+#
+
+import base_test_class
+
+class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
+    """
+    Test file created with libxlsxwriter against a file created by Excel.
+
+    """
+
+    def test_chart_stock01(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:formatCode']}
+        self.run_exe_test('test_chart_stock01')
+
+    def test_chart_stock02(self):
+        self.ignore_elements = {
+            'xl/charts/chart1.xml': ['<c:formatCode'],
+            'xl/workbook.xml': ['<fileVersion', '<calcPr'],
+            'xl/worksheets/sheet1.xml': [
+                '<sheetView',
+                '<selection activeCell',
+                '</sheetView',
+            ],
+        }
+        self.run_exe_test('test_chart_stock02')
+
+    def test_chart_stock03(self):
+        self.ignore_elements = {'xl/charts/chart1.xml': ['<c:formatCode']}
+        self.run_exe_test('test_chart_stock03')
diff --git a/test/functional/test_checkbox.py b/test/functional/test_checkbox.py
new file mode 100644
index 00000000..479eee64
--- /dev/null
+++ b/test/functional/test_checkbox.py
@@ -0,0 +1,19 @@
+###############################################################################
+#
+# Tests for libxlsxwriter.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+# Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+#
+
+import base_test_class
+
+class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
+    """
+    Test file created with libxlsxwriter against a file created by Excel.
+
+    """
+
+    def test_checkbox01(self):
+        self.run_exe_test('test_checkbox01')
+
diff --git a/test/functional/test_sparkline.py b/test/functional/test_sparkline.py
new file mode 100644
index 00000000..773161ab
--- /dev/null
+++ b/test/functional/test_sparkline.py
@@ -0,0 +1,25 @@
+###############################################################################
+#
+# Tests for libxlsxwriter.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+# Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+#
+
+import base_test_class
+
+class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
+    """
+    Test file created with libxlsxwriter against a file created by Excel.
+
+    """
+
+    def test_sparkline01(self):
+        self.run_exe_test('test_sparkline01')
+
+    def test_sparkline02(self):
+        self.run_exe_test('test_sparkline02')
+
+    def test_sparkline03(self):
+        self.run_exe_test('test_sparkline03')
+
diff --git a/test/functional/test_textbox.py b/test/functional/test_textbox.py
new file mode 100644
index 00000000..ec12cc15
--- /dev/null
+++ b/test/functional/test_textbox.py
@@ -0,0 +1,19 @@
+###############################################################################
+#
+# Tests for libxlsxwriter.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+# Copyright 2014-2025, John McNamara, jmcnamara@cpan.org.
+#
+
+import base_test_class
+
+class TestCompareXLSXFiles(base_test_class.XLSXBaseTest):
+    """
+    Test file created with libxlsxwriter against a file created by Excel.
+
+    """
+
+    def test_textbox01(self):
+        self.run_exe_test('test_textbox01')
+
diff --git a/test/functional/xlsx_files/autofit01.xlsx b/test/functional/xlsx_files/autofit01.xlsx
new file mode 100644
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diff --git a/test/functional/xlsx_files/autofit08.xlsx b/test/functional/xlsx_files/autofit08.xlsx
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literal 0
HcmV?d00001

diff --git a/test/unit/chart/test_chart.c b/test/unit/chart/test_chart.c
index 67f622a5..d1f94d90 100644
--- a/test/unit/chart/test_chart.c
+++ b/test/unit/chart/test_chart.c
@@ -142,8 +142,8 @@ CTEST(chart, chart01) {
     lxw_chart *chart = lxw_chart_new(LXW_CHART_BAR);
     chart->file = testfile;
 
-    series1 = chart_add_series(chart, NULL, "Sheet1!$A$1:$A$5");
-    series2 = chart_add_series(chart, NULL, "Sheet1!$B$1:$B$5");
+    series1 = chart_add_series(chart, NULL, "Sheet1!$A$1:$A$5", 0);
+    series2 = chart_add_series(chart, NULL, "Sheet1!$B$1:$B$5", 0);
 
     lxw_chart_add_data_cache(series1->values, data[0], 5, 3, 0);
     lxw_chart_add_data_cache(series2->values, data[0], 5, 3, 1);

From ba048905125945e57f6a8f5038c7b30d5f8166f8 Mon Sep 17 00:00:00 2001
From: Nick <nick@kruftindustries.com>
Date: Sat, 3 Jan 2026 00:40:38 -0600
Subject: [PATCH 2/2] added missing limit checks and improved tests

---
 include/xlsxwriter/chart.h                |  10 +-
 include/xlsxwriter/common.h               |   3 +
 include/xlsxwriter/feature_property_bag.h |   6 +-
 include/xlsxwriter/sparkline.h            |   2 +-
 include/xlsxwriter/utility.h              |  24 ++
 include/xlsxwriter/worksheet.h            |   7 +-
 src/chart.c                               |  66 +++---
 src/drawing.c                             |   3 +-
 src/feature_property_bag.c                |   2 +-
 src/format.c                              |  19 ++
 src/labview_wrappers.c                    | 201 +++++++----------
 src/styles.c                              |   2 +-
 src/utility.c                             | 262 ++++++++++++++--------
 src/workbook.c                            |  13 +-
 src/worksheet.c                           |  11 +-
 15 files changed, 346 insertions(+), 285 deletions(-)

diff --git a/include/xlsxwriter/chart.h b/include/xlsxwriter/chart.h
index 3c6e2285..d7c1c9fb 100644
--- a/include/xlsxwriter/chart.h
+++ b/include/xlsxwriter/chart.h
@@ -735,6 +735,7 @@ typedef enum lxw_chart_gradient_fill_type {
 
     /** Path gradient fill. */
     LXW_CHART_GRADIENT_FILL_PATH
+
 } lxw_chart_gradient_fill_type;
 
 /** Maximum number of gradient stops. */
@@ -1461,7 +1462,8 @@ void lxw_chart_assemble_xml_file(lxw_chart *chart);
  */
 lxw_chart_series *chart_add_series_impl(lxw_chart *chart,
                                         const char *categories,
-                                        const char *values, uint8_t y2_axis);
+                                        const char *values,
+                                        uint8_t y2_axis);
 
 /**
  * @brief Macro wrapper for chart_add_series_impl with optional y2_axis parameter.
@@ -1707,7 +1709,7 @@ void chart_series_set_pattern(lxw_chart_series *series,
  * For more information see #lxw_chart_gradient_fill_type and @ref chart_gradient_fills.
  */
 void chart_series_set_gradient(lxw_chart_series *series,
-                               lxw_chart_gradient_fill * gradient);
+                               lxw_chart_gradient_fill *gradient);
 
 /**
  * @brief Set the data marker type for a series.
@@ -3812,7 +3814,7 @@ void chart_chartarea_set_pattern(lxw_chart *chart,
  * For more information see #lxw_chart_gradient_fill_type.
  */
 void chart_chartarea_set_gradient(lxw_chart *chart,
-                                  lxw_chart_gradient_fill * gradient);
+                                  lxw_chart_gradient_fill *gradient);
 
 /**
  * @brief Set the line properties for a plotarea.
@@ -3885,7 +3887,7 @@ void chart_plotarea_set_pattern(lxw_chart *chart, lxw_chart_pattern *pattern);
  * For more information see #lxw_chart_gradient_fill_type.
  */
 void chart_plotarea_set_gradient(lxw_chart *chart,
-                                 lxw_chart_gradient_fill * gradient);
+                                 lxw_chart_gradient_fill *gradient);
 
 /**
  * @brief Set the manual layout of the chart plotarea.
diff --git a/include/xlsxwriter/common.h b/include/xlsxwriter/common.h
index 2b793223..f7b281f6 100644
--- a/include/xlsxwriter/common.h
+++ b/include/xlsxwriter/common.h
@@ -110,6 +110,9 @@ typedef enum lxw_error {
     /** Function string parameter is empty. */
     LXW_ERROR_PARAMETER_IS_EMPTY,
 
+    /** A #lxw_datetime parameter has a validation error. */
+    LXW_ERROR_DATETIME_VALIDATION,
+
     /** Worksheet name exceeds Excel's limit of 31 characters. */
     LXW_ERROR_SHEETNAME_LENGTH_EXCEEDED,
 
diff --git a/include/xlsxwriter/feature_property_bag.h b/include/xlsxwriter/feature_property_bag.h
index 5e203c3a..cb79eefc 100644
--- a/include/xlsxwriter/feature_property_bag.h
+++ b/include/xlsxwriter/feature_property_bag.h
@@ -39,10 +39,8 @@ extern "C" {
 /* *INDENT-ON* */
 
 lxw_feature_property_bag *lxw_feature_property_bag_new(void);
-void lxw_feature_property_bag_free(lxw_feature_property_bag
-                                   *feature_property_bag);
-void lxw_feature_property_bag_assemble_xml_file(lxw_feature_property_bag
-                                                *self);
+void lxw_feature_property_bag_free(lxw_feature_property_bag *feature_property_bag);
+void lxw_feature_property_bag_assemble_xml_file(lxw_feature_property_bag *self);
 
 /* Declarations required for unit testing. */
 #ifdef TESTING
diff --git a/include/xlsxwriter/sparkline.h b/include/xlsxwriter/sparkline.h
index e99469ac..6f41a2f9 100644
--- a/include/xlsxwriter/sparkline.h
+++ b/include/xlsxwriter/sparkline.h
@@ -160,7 +160,7 @@ typedef struct lxw_sparkline_options {
 /* Internal sparkline structure with resolved values */
 typedef struct lxw_sparkline {
 
-    STAILQ_ENTRY (lxw_sparkline) list_pointers;
+    STAILQ_ENTRY(lxw_sparkline) list_pointers;
 
     char *range;
     lxw_row_t row;
diff --git a/include/xlsxwriter/utility.h b/include/xlsxwriter/utility.h
index 6653f1af..80f2e2ef 100644
--- a/include/xlsxwriter/utility.h
+++ b/include/xlsxwriter/utility.h
@@ -212,6 +212,30 @@ double lxw_datetime_to_excel_datetime(lxw_datetime *datetime);
 double lxw_datetime_to_excel_date_with_epoch(lxw_datetime *datetime,
                                              uint8_t use_1904_epoch);
 
+/**
+ * @brief Validate a #lxw_datetime struct.
+ *
+ * Validates a #lxw_datetime struct to ensure its fields are within acceptable
+ * ranges for Excel dates and times.
+ *
+ * The members of the #lxw_datetime struct and the range of their values are:
+ *
+ * Member   | Value
+ * -------- | -----------
+ * year     | 1900 - 9999
+ * month    | 1 - 12
+ * day      | 1 - 31
+ * hour     | 0 - 23
+ * min      | 0 - 59
+ * sec      | 0 - 59.999
+ *
+ * @param datetime A pointer to a #lxw_datetime struct.
+ *
+ * @return A #lxw_error code. Either #LXW_NO_ERROR or
+ *         #LXW_ERROR_DATETIME_VALIDATION if a field is out of range.
+ */
+lxw_error lxw_datetime_validate(lxw_datetime *datetime);
+
 /**
  * @brief Converts a unix datetime to an Excel datetime number.
  *
diff --git a/include/xlsxwriter/worksheet.h b/include/xlsxwriter/worksheet.h
index 26f899d7..6fd82c0a 100644
--- a/include/xlsxwriter/worksheet.h
+++ b/include/xlsxwriter/worksheet.h
@@ -2983,7 +2983,8 @@ lxw_error worksheet_write_boolean(lxw_worksheet *worksheet,
  *
  */
 lxw_error worksheet_insert_checkbox(lxw_worksheet *worksheet,
-                                    lxw_row_t row, lxw_col_t col, int value);
+                                    lxw_row_t row, lxw_col_t col,
+                                    int value);
 
 /**
  * @brief Write a formatted blank worksheet cell.
@@ -4154,7 +4155,7 @@ lxw_error worksheet_insert_textbox(lxw_worksheet *worksheet,
 lxw_error worksheet_insert_textbox_opt(lxw_worksheet *worksheet,
                                        lxw_row_t row, lxw_col_t col,
                                        const char *text,
-                                       lxw_textbox_options * user_options);
+                                       lxw_textbox_options *user_options);
 
 /**
  * @brief Merge a range of cells.
@@ -4651,7 +4652,7 @@ lxw_error worksheet_add_table(lxw_worksheet *worksheet, lxw_row_t first_row,
  */
 lxw_error worksheet_add_sparkline(lxw_worksheet *worksheet,
                                   lxw_row_t row, lxw_col_t col,
-                                  lxw_sparkline_options * options);
+                                  lxw_sparkline_options *options);
 
  /**
   * @brief Make a worksheet the active, i.e., visible worksheet.
diff --git a/src/chart.c b/src/chart.c
index 982e0c4a..4eb52eaa 100644
--- a/src/chart.c
+++ b/src/chart.c
@@ -324,10 +324,10 @@ lxw_chart_new(uint8_t type)
     chart->y_axis->axis_position = LXW_CHART_AXIS_LEFT;
 
     /* Set the default secondary axis positions and properties. */
-    chart->x2_axis->axis_position = LXW_CHART_AXIS_BOTTOM;      /* Same as primary X axis */
+    chart->x2_axis->axis_position = LXW_CHART_AXIS_BOTTOM;  /* Same as primary X axis */
     chart->y2_axis->axis_position = LXW_CHART_AXIS_RIGHT;
     chart->x2_axis->hidden = LXW_TRUE;  /* Secondary X axis hidden by default */
-    chart->y2_axis->crossing_max = LXW_TRUE;    /* Secondary Y axis crosses at max */
+    chart->y2_axis->crossing_max = LXW_TRUE;  /* Secondary Y axis crosses at max */
 
     /* Set the default axis number formats. */
     _chart_axis_set_default_num_format(chart->x_axis, "General");
@@ -511,8 +511,7 @@ _chart_convert_gradient_args(lxw_chart_gradient_fill *user_gradient)
     gradient->angle = user_gradient->angle;
 
     /* Set default angle for linear gradients. */
-    if (gradient->type == LXW_CHART_GRADIENT_FILL_LINEAR
-        && gradient->angle == 0)
+    if (gradient->type == LXW_CHART_GRADIENT_FILL_LINEAR && gradient->angle == 0)
         gradient->angle = 90;
 
     for (i = 0; i < gradient->num_stops; i++) {
@@ -2302,8 +2301,7 @@ _chart_write_a_grad_fill(lxw_chart *self, lxw_chart_gradient_fill *gradient)
  */
 STATIC void
 _chart_write_sp_pr_with_gradient(lxw_chart *self, lxw_chart_line *line,
-                                 lxw_chart_fill *fill,
-                                 lxw_chart_pattern *pattern,
+                                 lxw_chart_fill *fill, lxw_chart_pattern *pattern,
                                  lxw_chart_gradient_fill *gradient)
 {
     if (!line && !fill && !pattern && !gradient)
@@ -5575,13 +5573,12 @@ _chart_write_stock_chart(lxw_chart *self, uint8_t primary_axes)
     uint16_t index = 0;
 
     /* Default line for stock chart series (width 2.25, noFill). */
-    lxw_chart_line default_line = {.width = 2.25,.none = LXW_TRUE };
+    lxw_chart_line default_line = {.width = 2.25, .none = LXW_TRUE};
 
     /* Default markers for stock chart series. */
-    lxw_chart_marker default_marker_none = {.type = LXW_CHART_MARKER_NONE };
+    lxw_chart_marker default_marker_none = {.type = LXW_CHART_MARKER_NONE};
     lxw_chart_marker default_marker_dot = {.type = LXW_CHART_MARKER_DOT,
-        .size = 3
-    };
+                                            .size = 3};
 
     /* Check if there are any series for this axis type. */
     STAILQ_FOREACH(series, self->series_list, list_pointers) {
@@ -5881,10 +5878,8 @@ _chart_write_scatter_plot_area(lxw_chart *self)
     }
 
     /* Write the c:spPr element for the plotarea formatting. */
-    _chart_write_sp_pr_with_gradient(self, self->plotarea_line,
-                                     self->plotarea_fill,
-                                     self->plotarea_pattern,
-                                     self->plotarea_gradient);
+    _chart_write_sp_pr_with_gradient(self, self->plotarea_line, self->plotarea_fill,
+                                     self->plotarea_pattern, self->plotarea_gradient);
 
     lxw_xml_end_tag(self->file, "c:plotArea");
 }
@@ -5913,10 +5908,8 @@ _chart_write_pie_plot_area(lxw_chart *self)
     }
 
     /* Write the c:spPr element for the plotarea formatting. */
-    _chart_write_sp_pr_with_gradient(self, self->plotarea_line,
-                                     self->plotarea_fill,
-                                     self->plotarea_pattern,
-                                     self->plotarea_gradient);
+    _chart_write_sp_pr_with_gradient(self, self->plotarea_line, self->plotarea_fill,
+                                     self->plotarea_pattern, self->plotarea_gradient);
 
     lxw_xml_end_tag(self->file, "c:plotArea");
 }
@@ -5986,10 +5979,8 @@ _chart_write_stock_plot_area(lxw_chart *self)
     _chart_write_d_table(self);
 
     /* Write the c:spPr element for the plotarea formatting. */
-    _chart_write_sp_pr_with_gradient(self, self->plotarea_line,
-                                     self->plotarea_fill,
-                                     self->plotarea_pattern,
-                                     self->plotarea_gradient);
+    _chart_write_sp_pr_with_gradient(self, self->plotarea_line, self->plotarea_fill,
+                                     self->plotarea_pattern, self->plotarea_gradient);
 
     lxw_xml_end_tag(self->file, "c:plotArea");
 }
@@ -6072,10 +6063,8 @@ _chart_write_plot_area(lxw_chart *self)
     _chart_write_d_table(self);
 
     /* Write the c:spPr element for the plotarea formatting. */
-    _chart_write_sp_pr_with_gradient(self, self->plotarea_line,
-                                     self->plotarea_fill,
-                                     self->plotarea_pattern,
-                                     self->plotarea_gradient);
+    _chart_write_sp_pr_with_gradient(self, self->plotarea_line, self->plotarea_fill,
+                                     self->plotarea_pattern, self->plotarea_gradient);
 
     lxw_xml_end_tag(self->file, "c:plotArea");
 }
@@ -6435,10 +6424,8 @@ lxw_chart_assemble_xml_file(lxw_chart *self)
     _chart_write_chart(self);
 
     /* Write the c:spPr element for the chartarea formatting. */
-    _chart_write_sp_pr_with_gradient(self, self->chartarea_line,
-                                     self->chartarea_fill,
-                                     self->chartarea_pattern,
-                                     self->chartarea_gradient);
+    _chart_write_sp_pr_with_gradient(self, self->chartarea_line, self->chartarea_fill,
+                                     self->chartarea_pattern, self->chartarea_gradient);
 
     /* Write the c:printSettings element. */
     if (!self->is_chartsheet)
@@ -6481,14 +6468,15 @@ lxw_chart_add_data_cache(lxw_series_range *range, uint8_t *data,
  * Add a series to the chart.
  */
 lxw_chart_series *
-chart_add_series_impl(lxw_chart *self, const char *categories,
-                      const char *values, uint8_t y2_axis)
+chart_add_series_impl(lxw_chart *self, const char *categories, const char *values,
+                      uint8_t y2_axis)
 {
     lxw_chart_series *series;
 
     /* Scatter charts require categories and values. */
     if (self->chart_group == LXW_CHART_SCATTER && values && !categories) {
-        LXW_WARN("chart_add_series(): scatter charts must have " "'categories' and 'values'");  /* Keep user-facing name */
+        LXW_WARN("chart_add_series(): scatter charts must have "
+                 "'categories' and 'values'");  /* Keep user-facing name */
 
         return NULL;
     }
@@ -7964,8 +7952,7 @@ chart_chartarea_set_pattern(lxw_chart *self, lxw_chart_pattern *pattern)
  * Set a gradient fill type for the chartarea.
  */
 void
-chart_chartarea_set_gradient(lxw_chart *self,
-                             lxw_chart_gradient_fill *gradient)
+chart_chartarea_set_gradient(lxw_chart *self, lxw_chart_gradient_fill *gradient)
 {
     if (!gradient)
         return;
@@ -8025,8 +8012,7 @@ chart_plotarea_set_pattern(lxw_chart *self, lxw_chart_pattern *pattern)
  * Set a gradient fill type for the plotarea.
  */
 void
-chart_plotarea_set_gradient(lxw_chart *self,
-                            lxw_chart_gradient_fill *gradient)
+chart_plotarea_set_gradient(lxw_chart *self, lxw_chart_gradient_fill *gradient)
 {
     if (!gradient)
         return;
@@ -8207,9 +8193,9 @@ chart_set_series_overlap_y2(lxw_chart *self, int8_t overlap)
     if (overlap >= -100 && overlap <= 100)
         self->overlap_y2 = overlap;
     else
-        LXW_WARN_FORMAT1
-            ("chart_set_series_overlap_y2(): Chart series overlap "
-             "'%d' outside Excel range: -100 <= overlap <= 100", overlap);
+        LXW_WARN_FORMAT1("chart_set_series_overlap_y2(): Chart series overlap "
+                         "'%d' outside Excel range: -100 <= overlap <= 100",
+                         overlap);
 }
 
 /*
diff --git a/src/drawing.c b/src/drawing.c
index 061e6190..952b9c01 100644
--- a/src/drawing.c
+++ b/src/drawing.c
@@ -664,8 +664,7 @@ _drawing_write_a_prst_geom_rect(lxw_drawing *self)
  * Write the <xdr:spPr> element for shapes.
  */
 STATIC void
-_drawing_write_sp_pr_shape(lxw_drawing *self,
-                           lxw_drawing_object *drawing_object)
+_drawing_write_sp_pr_shape(lxw_drawing *self, lxw_drawing_object *drawing_object)
 {
     struct xml_attribute_list attributes;
     struct xml_attribute *attribute;
diff --git a/src/feature_property_bag.c b/src/feature_property_bag.c
index 5a70e5ec..96dd3825 100644
--- a/src/feature_property_bag.c
+++ b/src/feature_property_bag.c
@@ -78,7 +78,7 @@ _write_feature_property_bags(lxw_feature_property_bag *self)
 
     LXW_INIT_ATTRIBUTES();
     LXW_PUSH_ATTRIBUTES_STR("xmlns",
-                            "http://schemas.microsoft.com/office/spreadsheetml/2022/featurepropertybag");
+        "http://schemas.microsoft.com/office/spreadsheetml/2022/featurepropertybag");
 
     lxw_xml_start_tag(self->file, "FeaturePropertyBags", &attributes);
 
diff --git a/src/format.c b/src/format.c
index dea02ac0..d379bcae 100644
--- a/src/format.c
+++ b/src/format.c
@@ -548,6 +548,12 @@ format_set_text_justlast(lxw_format *self)
 void
 format_set_pattern(lxw_format *self, uint8_t value)
 {
+    if (value > LXW_PATTERN_GRAY_0625) {
+        LXW_WARN_FORMAT1("format_set_pattern(): invalid pattern value: %d",
+                         value);
+        return;
+    }
+
     self->pattern = value;
 }
 
@@ -691,6 +697,12 @@ format_set_diag_color(lxw_format *self, lxw_color_t color)
 void
 format_set_diag_border(lxw_format *self, uint8_t style)
 {
+    if (style > LXW_BORDER_SLANT_DASH_DOT) {
+        LXW_WARN_FORMAT1("format_set_diag_border(): invalid border style: %d",
+                         style);
+        return;
+    }
+
     self->diag_border = style;
 }
 
@@ -709,6 +721,13 @@ format_set_num_format_index(lxw_format *self, uint8_t value)
 void
 format_set_valign(lxw_format *self, uint8_t value)
 {
+    if (value > LXW_ALIGN_VERTICAL_DISTRIBUTED) {
+        LXW_WARN_FORMAT1
+            ("format_set_valign(): invalid vertical alignment value: %d",
+             value);
+        return;
+    }
+
     self->text_v_align = value;
 }
 
diff --git a/src/labview_wrappers.c b/src/labview_wrappers.c
index cb47538d..91c8e725 100644
--- a/src/labview_wrappers.c
+++ b/src/labview_wrappers.c
@@ -36,7 +36,7 @@ ansi_to_utf8(const char *ansi_str)
     if (wide_len == 0)
         return NULL;
 
-    wchar_t *wide_str = (wchar_t *) malloc(wide_len * sizeof(wchar_t));
+    wchar_t *wide_str = (wchar_t *)malloc(wide_len * sizeof(wchar_t));
     if (!wide_str)
         return NULL;
 
@@ -46,21 +46,19 @@ ansi_to_utf8(const char *ansi_str)
     }
 
     /* Then convert UTF-16 to UTF-8 */
-    int utf8_len =
-        WideCharToMultiByte(CP_UTF8, 0, wide_str, -1, NULL, 0, NULL, NULL);
+    int utf8_len = WideCharToMultiByte(CP_UTF8, 0, wide_str, -1, NULL, 0, NULL, NULL);
     if (utf8_len == 0) {
         free(wide_str);
         return NULL;
     }
 
-    char *utf8_str = (char *) malloc(utf8_len);
+    char *utf8_str = (char *)malloc(utf8_len);
     if (!utf8_str) {
         free(wide_str);
         return NULL;
     }
 
-    if (WideCharToMultiByte
-        (CP_UTF8, 0, wide_str, -1, utf8_str, utf8_len, NULL, NULL) == 0) {
+    if (WideCharToMultiByte(CP_UTF8, 0, wide_str, -1, utf8_str, utf8_len, NULL, NULL) == 0) {
         free(wide_str);
         free(utf8_str);
         return NULL;
@@ -89,27 +87,21 @@ ansi_to_utf8(const char *str)
  * ============================================================================ */
 
 lxw_error
-worksheet_write_string_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                          lxw_col_t col, const char *string,
-                          lxw_format *format)
+worksheet_write_string_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                          const char *string, lxw_format *format)
 {
     char *utf8 = ansi_to_utf8(string);
-    lxw_error err =
-        worksheet_write_string(worksheet, row, col, utf8 ? utf8 : string,
-                               format);
+    lxw_error err = worksheet_write_string(worksheet, row, col, utf8 ? utf8 : string, format);
     free(utf8);
     return err;
 }
 
 lxw_error
-worksheet_write_formula_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                           lxw_col_t col, const char *formula,
-                           lxw_format *format)
+worksheet_write_formula_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                           const char *formula, lxw_format *format)
 {
     char *utf8 = ansi_to_utf8(formula);
-    lxw_error err =
-        worksheet_write_formula(worksheet, row, col, utf8 ? utf8 : formula,
-                                format);
+    lxw_error err = worksheet_write_formula(worksheet, row, col, utf8 ? utf8 : formula, format);
     free(utf8);
     return err;
 }
@@ -119,19 +111,17 @@ worksheet_write_url_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
                        const char *url, lxw_format *format)
 {
     char *utf8 = ansi_to_utf8(url);
-    lxw_error err =
-        worksheet_write_url(worksheet, row, col, utf8 ? utf8 : url, format);
+    lxw_error err = worksheet_write_url(worksheet, row, col, utf8 ? utf8 : url, format);
     free(utf8);
     return err;
 }
 
 lxw_error
-worksheet_write_comment_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                           lxw_col_t col, const char *string)
+worksheet_write_comment_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                           const char *string)
 {
     char *utf8 = ansi_to_utf8(string);
-    lxw_error err =
-        worksheet_write_comment(worksheet, row, col, utf8 ? utf8 : string);
+    lxw_error err = worksheet_write_comment(worksheet, row, col, utf8 ? utf8 : string);
     free(utf8);
     return err;
 }
@@ -155,16 +145,13 @@ worksheet_set_footer_lv(lxw_worksheet *worksheet, const char *footer)
 }
 
 lxw_error
-worksheet_merge_range_lv(lxw_worksheet *worksheet, lxw_row_t first_row,
-                         lxw_col_t first_col, lxw_row_t last_row,
-                         lxw_col_t last_col, const char *string,
+worksheet_merge_range_lv(lxw_worksheet *worksheet, lxw_row_t first_row, lxw_col_t first_col,
+                         lxw_row_t last_row, lxw_col_t last_col, const char *string,
                          lxw_format *format)
 {
     char *utf8 = ansi_to_utf8(string);
-    lxw_error err =
-        worksheet_merge_range(worksheet, first_row, first_col, last_row,
-                              last_col,
-                              utf8 ? utf8 : string, format);
+    lxw_error err = worksheet_merge_range(worksheet, first_row, first_col, last_row, last_col,
+                                          utf8 ? utf8 : string, format);
     free(utf8);
     return err;
 }
@@ -178,25 +165,21 @@ worksheet_set_comments_author_lv(lxw_worksheet *worksheet, const char *author)
 }
 
 lxw_error
-worksheet_insert_textbox_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                            lxw_col_t col, const char *text)
+worksheet_insert_textbox_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                            const char *text)
 {
     char *utf8 = ansi_to_utf8(text);
-    lxw_error err =
-        worksheet_insert_textbox(worksheet, row, col, utf8 ? utf8 : text);
+    lxw_error err = worksheet_insert_textbox(worksheet, row, col, utf8 ? utf8 : text);
     free(utf8);
     return err;
 }
 
 lxw_error
-worksheet_insert_textbox_opt_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                                lxw_col_t col, const char *text,
-                                lxw_textbox_options *options)
+worksheet_insert_textbox_opt_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                                const char *text, lxw_textbox_options *options)
 {
     char *utf8 = ansi_to_utf8(text);
-    lxw_error err =
-        worksheet_insert_textbox_opt(worksheet, row, col, utf8 ? utf8 : text,
-                                     options);
+    lxw_error err = worksheet_insert_textbox_opt(worksheet, row, col, utf8 ? utf8 : text, options);
     free(utf8);
     return err;
 }
@@ -206,17 +189,15 @@ worksheet_insert_textbox_opt_lv(lxw_worksheet *worksheet, lxw_row_t row,
  * ============================================================================ */
 
 lxw_chart_series *
-chart_add_series_lv(lxw_chart *chart, const char *categories,
-                    const char *values, uint8_t y2_axis)
+chart_add_series_lv(lxw_chart *chart, const char *categories, const char *values,
+                    uint8_t y2_axis)
 {
     char *utf8_cat = ansi_to_utf8(categories);
     char *utf8_val = ansi_to_utf8(values);
     lxw_chart_series *series = chart_add_series_impl(chart,
-                                                     utf8_cat ? utf8_cat :
-                                                     categories,
-                                                     utf8_val ? utf8_val :
-                                                     values,
-                                                     y2_axis);
+                                                      utf8_cat ? utf8_cat : categories,
+                                                      utf8_val ? utf8_val : values,
+                                                      y2_axis);
     free(utf8_cat);
     free(utf8_val);
     return series;
@@ -263,8 +244,7 @@ chart_axis_set_num_format_lv(lxw_chart_axis *axis, const char *num_format)
 }
 
 void
-chart_series_set_labels_num_format_lv(lxw_chart_series *series,
-                                      const char *num_format)
+chart_series_set_labels_num_format_lv(lxw_chart_series *series, const char *num_format)
 {
     char *utf8 = ansi_to_utf8(num_format);
     chart_series_set_labels_num_format(series, utf8 ? utf8 : num_format);
@@ -272,10 +252,9 @@ chart_series_set_labels_num_format_lv(lxw_chart_series *series,
 }
 
 void
-chart_series_set_categories_lv(lxw_chart_series *series,
-                               const char *sheetname, lxw_row_t first_row,
-                               lxw_col_t first_col, lxw_row_t last_row,
-                               lxw_col_t last_col)
+chart_series_set_categories_lv(lxw_chart_series *series, const char *sheetname,
+                               lxw_row_t first_row, lxw_col_t first_col,
+                               lxw_row_t last_row, lxw_col_t last_col)
 {
     char *utf8 = ansi_to_utf8(sheetname);
     chart_series_set_categories(series, utf8 ? utf8 : sheetname,
@@ -295,9 +274,8 @@ chart_series_set_values_lv(lxw_chart_series *series, const char *sheetname,
 }
 
 void
-chart_series_set_name_range_lv(lxw_chart_series *series,
-                               const char *sheetname, lxw_row_t row,
-                               lxw_col_t col)
+chart_series_set_name_range_lv(lxw_chart_series *series, const char *sheetname,
+                               lxw_row_t row, lxw_col_t col)
 {
     char *utf8 = ansi_to_utf8(sheetname);
     chart_series_set_name_range(series, utf8 ? utf8 : sheetname, row, col);
@@ -354,8 +332,7 @@ workbook_add_worksheet_lv(lxw_workbook *workbook, const char *sheetname)
         return workbook_add_worksheet(workbook, NULL);
     }
     char *utf8 = ansi_to_utf8(sheetname);
-    lxw_worksheet *ws =
-        workbook_add_worksheet(workbook, utf8 ? utf8 : sheetname);
+    lxw_worksheet *ws = workbook_add_worksheet(workbook, utf8 ? utf8 : sheetname);
     free(utf8);
     return ws;
 }
@@ -368,22 +345,19 @@ workbook_add_chartsheet_lv(lxw_workbook *workbook, const char *sheetname)
         return workbook_add_chartsheet(workbook, NULL);
     }
     char *utf8 = ansi_to_utf8(sheetname);
-    lxw_chartsheet *cs =
-        workbook_add_chartsheet(workbook, utf8 ? utf8 : sheetname);
+    lxw_chartsheet *cs = workbook_add_chartsheet(workbook, utf8 ? utf8 : sheetname);
     free(utf8);
     return cs;
 }
 
 lxw_error
-workbook_define_name_lv(lxw_workbook *workbook, const char *name,
-                        const char *formula)
+workbook_define_name_lv(lxw_workbook *workbook, const char *name, const char *formula)
 {
     char *utf8_name = ansi_to_utf8(name);
     char *utf8_formula = ansi_to_utf8(formula);
     lxw_error err = workbook_define_name(workbook,
                                          utf8_name ? utf8_name : name,
-                                         utf8_formula ? utf8_formula :
-                                         formula);
+                                         utf8_formula ? utf8_formula : formula);
     free(utf8_name);
     free(utf8_formula);
     return err;
@@ -393,8 +367,7 @@ lxw_worksheet *
 workbook_get_worksheet_by_name_lv(lxw_workbook *workbook, const char *name)
 {
     char *utf8 = ansi_to_utf8(name);
-    lxw_worksheet *ws =
-        workbook_get_worksheet_by_name(workbook, utf8 ? utf8 : name);
+    lxw_worksheet *ws = workbook_get_worksheet_by_name(workbook, utf8 ? utf8 : name);
     free(utf8);
     return ws;
 }
@@ -403,8 +376,7 @@ lxw_chartsheet *
 workbook_get_chartsheet_by_name_lv(lxw_workbook *workbook, const char *name)
 {
     char *utf8 = ansi_to_utf8(name);
-    lxw_chartsheet *cs =
-        workbook_get_chartsheet_by_name(workbook, utf8 ? utf8 : name);
+    lxw_chartsheet *cs = workbook_get_chartsheet_by_name(workbook, utf8 ? utf8 : name);
     free(utf8);
     return cs;
 }
@@ -413,23 +385,20 @@ lxw_error
 workbook_validate_sheet_name_lv(lxw_workbook *workbook, const char *sheetname)
 {
     char *utf8 = ansi_to_utf8(sheetname);
-    lxw_error err =
-        workbook_validate_sheet_name(workbook, utf8 ? utf8 : sheetname);
+    lxw_error err = workbook_validate_sheet_name(workbook, utf8 ? utf8 : sheetname);
     free(utf8);
     return err;
 }
 
 lxw_error
-workbook_set_custom_property_string_lv(lxw_workbook *workbook,
-                                       const char *name, const char *value)
+workbook_set_custom_property_string_lv(lxw_workbook *workbook, const char *name,
+                                       const char *value)
 {
     char *utf8_name = ansi_to_utf8(name);
     char *utf8_value = ansi_to_utf8(value);
     lxw_error err = workbook_set_custom_property_string(workbook,
-                                                        utf8_name ? utf8_name
-                                                        : name,
-                                                        utf8_value ?
-                                                        utf8_value : value);
+                                                        utf8_name ? utf8_name : name,
+                                                        utf8_value ? utf8_value : value);
     free(utf8_name);
     free(utf8_value);
     return err;
@@ -480,49 +449,41 @@ workbook_new_opt_lv(const char *filename, lxw_workbook_options *options)
 }
 
 lxw_error
-worksheet_insert_image_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                          lxw_col_t col, const char *filename)
+worksheet_insert_image_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                          const char *filename)
 {
     char *utf8 = ansi_to_utf8(filename);
-    lxw_error err =
-        worksheet_insert_image(worksheet, row, col, utf8 ? utf8 : filename);
+    lxw_error err = worksheet_insert_image(worksheet, row, col, utf8 ? utf8 : filename);
     free(utf8);
     return err;
 }
 
 lxw_error
-worksheet_insert_image_opt_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                              lxw_col_t col, const char *filename,
-                              lxw_image_options *options)
+worksheet_insert_image_opt_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                              const char *filename, lxw_image_options *options)
 {
     char *utf8 = ansi_to_utf8(filename);
-    lxw_error err =
-        worksheet_insert_image_opt(worksheet, row, col,
-                                   utf8 ? utf8 : filename, options);
+    lxw_error err = worksheet_insert_image_opt(worksheet, row, col, utf8 ? utf8 : filename, options);
     free(utf8);
     return err;
 }
 
 lxw_error
-worksheet_embed_image_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                         lxw_col_t col, const char *filename)
+worksheet_embed_image_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                         const char *filename)
 {
     char *utf8 = ansi_to_utf8(filename);
-    lxw_error err =
-        worksheet_embed_image(worksheet, row, col, utf8 ? utf8 : filename);
+    lxw_error err = worksheet_embed_image(worksheet, row, col, utf8 ? utf8 : filename);
     free(utf8);
     return err;
 }
 
 lxw_error
-worksheet_embed_image_opt_lv(lxw_worksheet *worksheet, lxw_row_t row,
-                             lxw_col_t col, const char *filename,
-                             lxw_image_options *options)
+worksheet_embed_image_opt_lv(lxw_worksheet *worksheet, lxw_row_t row, lxw_col_t col,
+                             const char *filename, lxw_image_options *options)
 {
     char *utf8 = ansi_to_utf8(filename);
-    lxw_error err =
-        worksheet_embed_image_opt(worksheet, row, col, utf8 ? utf8 : filename,
-                                  options);
+    lxw_error err = worksheet_embed_image_opt(worksheet, row, col, utf8 ? utf8 : filename, options);
     free(utf8);
     return err;
 }
@@ -531,8 +492,7 @@ lxw_error
 worksheet_set_background_lv(lxw_worksheet *worksheet, const char *filename)
 {
     char *utf8 = ansi_to_utf8(filename);
-    lxw_error err =
-        worksheet_set_background(worksheet, utf8 ? utf8 : filename);
+    lxw_error err = worksheet_set_background(worksheet, utf8 ? utf8 : filename);
     free(utf8);
     return err;
 }
@@ -541,24 +501,20 @@ lxw_error
 workbook_add_vba_project_lv(lxw_workbook *workbook, const char *filename)
 {
     char *utf8 = ansi_to_utf8(filename);
-    lxw_error err =
-        workbook_add_vba_project(workbook, utf8 ? utf8 : filename);
+    lxw_error err = workbook_add_vba_project(workbook, utf8 ? utf8 : filename);
     free(utf8);
     return err;
 }
 
 lxw_error
-workbook_add_signed_vba_project_lv(lxw_workbook *workbook,
-                                   const char *vba_project,
+workbook_add_signed_vba_project_lv(lxw_workbook *workbook, const char *vba_project,
                                    const char *signature)
 {
     char *utf8_vba = ansi_to_utf8(vba_project);
     char *utf8_sig = ansi_to_utf8(signature);
     lxw_error err = workbook_add_signed_vba_project(workbook,
-                                                    utf8_vba ? utf8_vba :
-                                                    vba_project,
-                                                    utf8_sig ? utf8_sig :
-                                                    signature);
+                                                     utf8_vba ? utf8_vba : vba_project,
+                                                     utf8_sig ? utf8_sig : signature);
     free(utf8_vba);
     free(utf8_sig);
     return err;
@@ -570,10 +526,9 @@ workbook_add_signed_vba_project_lv(lxw_workbook *workbook,
 
 lxw_error
 worksheet_filter_column_lv(lxw_worksheet *worksheet, lxw_col_t col,
-                           uint8_t criteria, const char *value_string,
-                           double value)
+                           uint8_t criteria, const char *value_string, double value)
 {
-    lxw_filter_rule rule = { 0 };
+    lxw_filter_rule rule = {0};
     rule.criteria = criteria;
     rule.value = value;
 
@@ -592,13 +547,12 @@ worksheet_filter_column_lv(lxw_worksheet *worksheet, lxw_col_t col,
 
 lxw_error
 worksheet_filter_column2_lv(lxw_worksheet *worksheet, lxw_col_t col,
-                            uint8_t criteria1, const char *value_string1,
-                            double value1, uint8_t criteria2,
-                            const char *value_string2, double value2,
+                            uint8_t criteria1, const char *value_string1, double value1,
+                            uint8_t criteria2, const char *value_string2, double value2,
                             uint8_t and_or)
 {
-    lxw_filter_rule rule1 = { 0 };
-    lxw_filter_rule rule2 = { 0 };
+    lxw_filter_rule rule1 = {0};
+    lxw_filter_rule rule2 = {0};
     char *utf8_1 = NULL;
     char *utf8_2 = NULL;
 
@@ -617,8 +571,7 @@ worksheet_filter_column2_lv(lxw_worksheet *worksheet, lxw_col_t col,
         rule2.value_string = utf8_2 ? utf8_2 : value_string2;
     }
 
-    lxw_error err =
-        worksheet_filter_column2(worksheet, col, &rule1, &rule2, and_or);
+    lxw_error err = worksheet_filter_column2(worksheet, col, &rule1, &rule2, and_or);
 
     free(utf8_1);
     free(utf8_2);
@@ -632,7 +585,8 @@ worksheet_filter_column2_lv(lxw_worksheet *worksheet, lxw_col_t col,
 lxw_error
 chart_series_set_labels_custom_lv(lxw_chart_series *series,
                                   uintptr_t *values,
-                                  uint8_t *hide_flags, uint16_t count)
+                                  uint8_t *hide_flags,
+                                  uint16_t count)
 {
     lxw_error err = LXW_NO_ERROR;
     uint16_t i;
@@ -644,12 +598,9 @@ chart_series_set_labels_custom_lv(lxw_chart_series *series,
         return LXW_ERROR_NULL_PARAMETER_IGNORED;
 
     /* Allocate arrays */
-    labels =
-        (lxw_chart_data_label *) calloc(count, sizeof(lxw_chart_data_label));
-    label_ptrs =
-        (lxw_chart_data_label **) calloc(count + 1,
-                                         sizeof(lxw_chart_data_label *));
-    utf8_values = (char **) calloc(count, sizeof(char *));
+    labels = (lxw_chart_data_label *)calloc(count, sizeof(lxw_chart_data_label));
+    label_ptrs = (lxw_chart_data_label **)calloc(count + 1, sizeof(lxw_chart_data_label *));
+    utf8_values = (char **)calloc(count, sizeof(char *));
 
     if (!labels || !label_ptrs || !utf8_values) {
         free(labels);
@@ -666,7 +617,7 @@ chart_series_set_labels_custom_lv(lxw_chart_series *series,
         label_ptrs[i] = &labels[i];
 
         /* Get string pointer from uintptr_t array */
-        str = (values && values[i]) ? (const char *) values[i] : NULL;
+        str = (values && values[i]) ? (const char *)values[i] : NULL;
 
         /* Convert value string if provided */
         if (str && str[0]) {
diff --git a/src/styles.c b/src/styles.c
index 4fe04252..e4c96333 100644
--- a/src/styles.c
+++ b/src/styles.c
@@ -1201,7 +1201,7 @@ _write_xf_format_extensions(lxw_styles *self)
     LXW_INIT_ATTRIBUTES();
     LXW_PUSH_ATTRIBUTES_STR("uri", "{C7286773-470A-42A8-94C5-96B5CB345126}");
     LXW_PUSH_ATTRIBUTES_STR("xmlns:xfpb",
-                            "http://schemas.microsoft.com/office/spreadsheetml/2022/featurepropertybag");
+        "http://schemas.microsoft.com/office/spreadsheetml/2022/featurepropertybag");
 
     lxw_xml_start_tag(self->file, "ext", &attributes);
     LXW_FREE_ATTRIBUTES();
diff --git a/src/utility.c b/src/utility.c
index a88425a5..d3926176 100644
--- a/src/utility.c
+++ b/src/utility.c
@@ -41,6 +41,7 @@ char *error_strings[LXW_MAX_ERRNO + 1] = {
     "NULL function parameter ignored.",
     "Function parameter validation error.",
     "Function string parameter is empty.",
+    "A lxw_datetime parameter has a validation error.",
     "Worksheet name exceeds Excel's limit of 31 characters.",
     "Worksheet name cannot contain invalid characters: '[ ] : * ? / \\'",
     "Worksheet name cannot start or end with an apostrophe.",
@@ -332,6 +333,72 @@ lxw_name_to_col_2(const char *col_str)
         return 0;
 }
 
+/*
+ * Validate a lxw_datetime struct.
+ */
+lxw_error
+lxw_datetime_validate(lxw_datetime *datetime)
+{
+    if (!datetime)
+        return LXW_ERROR_DATETIME_VALIDATION;
+
+    /*
+     * Excel uses the year 1900 as the default epoch but it uses 1899-12-31 as
+     * the 0 date and internally we use the 0-0-0 date for time only values.
+     */
+    if (datetime->year < 1900 &&
+        !(datetime->year == 0 &&
+          datetime->month == 0 && datetime->day == 0) &&
+        !(datetime->year == 1899 &&
+          datetime->month == 12 && datetime->day == 31)) {
+
+        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid year: %d. "
+                         "Valid range is 1900-9999.", datetime->year);
+
+        return LXW_ERROR_DATETIME_VALIDATION;
+    }
+
+    if (datetime->year > 9999) {
+        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid year: %d. "
+                         "Valid range is 1900-9999.", datetime->year);
+        return LXW_ERROR_DATETIME_VALIDATION;
+    }
+
+    if (datetime->year != 0) {
+        if (datetime->month < 1 || datetime->month > 12) {
+            LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid month: %d. "
+                             "Valid range is 1-12.", datetime->month);
+            return LXW_ERROR_DATETIME_VALIDATION;
+        }
+
+        if (datetime->day < 1 || datetime->day > 31) {
+            LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid day: %d. "
+                             "Valid range is 1-31.", datetime->day);
+            return LXW_ERROR_DATETIME_VALIDATION;
+        }
+    }
+
+    if (datetime->hour < 0 || datetime->hour > 23) {
+        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid hour: %d. "
+                         "Valid range is 0-23.", datetime->hour);
+        return LXW_ERROR_DATETIME_VALIDATION;
+    }
+
+    if (datetime->min < 0 || datetime->min > 59) {
+        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid minute: %d. "
+                         "Valid range is 0-59.", datetime->min);
+        return LXW_ERROR_DATETIME_VALIDATION;
+    }
+
+    if (datetime->sec < 0.0 || datetime->sec >= 60.0) {
+        LXW_WARN_FORMAT1("lxw_datetime_validate(): invalid seconds: %.3f. "
+                         "Valid range is 0.0-59.999.", datetime->sec);
+        return LXW_ERROR_DATETIME_VALIDATION;
+    }
+
+    return LXW_NO_ERROR;
+}
+
 /*
  * Convert a lxw_datetime struct to an Excel serial date, with a 1900
  * or 1904 epoch.
@@ -357,6 +424,9 @@ lxw_datetime_to_excel_date_with_epoch(lxw_datetime *datetime,
     int days = 0;
     int i;
 
+    if (lxw_datetime_validate(datetime) != LXW_NO_ERROR)
+        return 0.0;
+
     /* For times without dates set the default date for the epoch. */
     if (!year) {
         if (!use_1904_epoch) {
@@ -688,101 +758,101 @@ lxw_hash_password(const char *password)
  * Unhandled characters (including UTF-8) default to width 8.
  */
 static const uint8_t char_widths[95] = {
-    3,                          /* space */
-    5,                          /* ! */
-    6,                          /* " */
-    7,                          /* # */
-    7,                          /* $ */
-    11,                         /* % */
-    10,                         /* & */
-    3,                          /* ' */
-    5,                          /* ( */
-    5,                          /* ) */
-    7,                          /* * */
-    7,                          /* + */
-    4,                          /* , */
-    5,                          /* - */
-    4,                          /* . */
-    6,                          /* / */
-    7,                          /* 0 */
-    7,                          /* 1 */
-    7,                          /* 2 */
-    7,                          /* 3 */
-    7,                          /* 4 */
-    7,                          /* 5 */
-    7,                          /* 6 */
-    7,                          /* 7 */
-    7,                          /* 8 */
-    7,                          /* 9 */
-    4,                          /* : */
-    4,                          /* ; */
-    7,                          /* < */
-    7,                          /* = */
-    7,                          /* > */
-    7,                          /* ? */
-    13,                         /* @ */
-    9,                          /* A */
-    8,                          /* B */
-    8,                          /* C */
-    9,                          /* D */
-    7,                          /* E */
-    7,                          /* F */
-    9,                          /* G */
-    9,                          /* H */
-    4,                          /* I */
-    5,                          /* J */
-    8,                          /* K */
-    6,                          /* L */
-    12,                         /* M */
-    10,                         /* N */
-    10,                         /* O */
-    8,                          /* P */
-    10,                         /* Q */
-    8,                          /* R */
-    7,                          /* S */
-    7,                          /* T */
-    9,                          /* U */
-    9,                          /* V */
-    13,                         /* W */
-    8,                          /* X */
-    7,                          /* Y */
-    7,                          /* Z */
-    5,                          /* [ */
-    6,                          /* backslash */
-    5,                          /* ] */
-    7,                          /* ^ */
-    7,                          /* _ */
-    4,                          /* ` */
-    7,                          /* a */
-    8,                          /* b */
-    6,                          /* c */
-    8,                          /* d */
-    8,                          /* e */
-    5,                          /* f */
-    7,                          /* g */
-    8,                          /* h */
-    4,                          /* i */
-    4,                          /* j */
-    7,                          /* k */
-    4,                          /* l */
-    12,                         /* m */
-    8,                          /* n */
-    8,                          /* o */
-    8,                          /* p */
-    8,                          /* q */
-    5,                          /* r */
-    6,                          /* s */
-    5,                          /* t */
-    8,                          /* u */
-    7,                          /* v */
-    11,                         /* w */
-    7,                          /* x */
-    7,                          /* y */
-    6,                          /* z */
-    5,                          /* { */
-    7,                          /* | */
-    5,                          /* } */
-    7                           /* ~ */
+    3,  /* space */
+    5,  /* ! */
+    6,  /* " */
+    7,  /* # */
+    7,  /* $ */
+    11, /* % */
+    10, /* & */
+    3,  /* ' */
+    5,  /* ( */
+    5,  /* ) */
+    7,  /* * */
+    7,  /* + */
+    4,  /* , */
+    5,  /* - */
+    4,  /* . */
+    6,  /* / */
+    7,  /* 0 */
+    7,  /* 1 */
+    7,  /* 2 */
+    7,  /* 3 */
+    7,  /* 4 */
+    7,  /* 5 */
+    7,  /* 6 */
+    7,  /* 7 */
+    7,  /* 8 */
+    7,  /* 9 */
+    4,  /* : */
+    4,  /* ; */
+    7,  /* < */
+    7,  /* = */
+    7,  /* > */
+    7,  /* ? */
+    13, /* @ */
+    9,  /* A */
+    8,  /* B */
+    8,  /* C */
+    9,  /* D */
+    7,  /* E */
+    7,  /* F */
+    9,  /* G */
+    9,  /* H */
+    4,  /* I */
+    5,  /* J */
+    8,  /* K */
+    6,  /* L */
+    12, /* M */
+    10, /* N */
+    10, /* O */
+    8,  /* P */
+    10, /* Q */
+    8,  /* R */
+    7,  /* S */
+    7,  /* T */
+    9,  /* U */
+    9,  /* V */
+    13, /* W */
+    8,  /* X */
+    7,  /* Y */
+    7,  /* Z */
+    5,  /* [ */
+    6,  /* backslash */
+    5,  /* ] */
+    7,  /* ^ */
+    7,  /* _ */
+    4,  /* ` */
+    7,  /* a */
+    8,  /* b */
+    6,  /* c */
+    8,  /* d */
+    8,  /* e */
+    5,  /* f */
+    7,  /* g */
+    8,  /* h */
+    4,  /* i */
+    4,  /* j */
+    7,  /* k */
+    4,  /* l */
+    12, /* m */
+    8,  /* n */
+    8,  /* o */
+    8,  /* p */
+    8,  /* q */
+    5,  /* r */
+    6,  /* s */
+    5,  /* t */
+    8,  /* u */
+    7,  /* v */
+    11, /* w */
+    7,  /* x */
+    7,  /* y */
+    6,  /* z */
+    5,  /* { */
+    7,  /* | */
+    5,  /* } */
+    7   /* ~ */
 };
 
 /*
@@ -819,7 +889,7 @@ lxw_autofit_width(const char *string)
 {
     uint16_t pixels;
     double width;
-    const double max_digit_width = 7.0; /* For Calibri 11 */
+    const double max_digit_width = 7.0;  /* For Calibri 11 */
     const double padding = 5.0;
 
     if (string == NULL || *string == '\0')
diff --git a/src/workbook.c b/src/workbook.c
index 3caf0fad..754e2a73 100644
--- a/src/workbook.c
+++ b/src/workbook.c
@@ -1272,8 +1272,7 @@ _prepare_drawings(lxw_workbook *self)
 
         /* Prepare worksheet textboxes. */
         STAILQ_FOREACH(object_props, worksheet->textbox_data, list_pointers) {
-            lxw_worksheet_prepare_textbox(worksheet, drawing_id,
-                                          object_props);
+            lxw_worksheet_prepare_textbox(worksheet, drawing_id, object_props);
         }
 
         /* Prepare worksheet header/footer images. */
@@ -2207,6 +2206,12 @@ workbook_add_chart(lxw_workbook *self, uint8_t type)
 {
     lxw_chart *chart;
 
+    if (type == LXW_CHART_NONE || type > LXW_CHART_STOCK) {
+        LXW_WARN_FORMAT1("workbook_add_chart(): invalid chart type: %d",
+                         type);
+        return NULL;
+    }
+
     /* Create a new chart object. */
     chart = lxw_chart_new(type);
 
@@ -2697,6 +2702,10 @@ workbook_set_custom_property_datetime(lxw_workbook *self, const char *name,
         return LXW_ERROR_NULL_PARAMETER_IGNORED;
     }
 
+    if (lxw_datetime_validate(datetime) != LXW_NO_ERROR) {
+        return LXW_ERROR_DATETIME_VALIDATION;
+    }
+
     /* Create a struct to hold the custom property. */
     custom_property = calloc(1, sizeof(struct lxw_custom_property));
     RETURN_ON_MEM_ERROR(custom_property, LXW_ERROR_MEMORY_MALLOC_FAILED);
diff --git a/src/worksheet.c b/src/worksheet.c
index f3ce0617..8c7b1a40 100644
--- a/src/worksheet.c
+++ b/src/worksheet.c
@@ -7293,8 +7293,7 @@ _worksheet_write_sparkline_color(lxw_worksheet *self, const char *tag,
  * Write the <x14:sparklineGroup> element.
  */
 STATIC void
-_worksheet_write_sparkline_group(lxw_worksheet *self,
-                                 lxw_sparkline *sparkline)
+_worksheet_write_sparkline_group(lxw_worksheet *self, lxw_sparkline *sparkline)
 {
     struct xml_attribute_list attributes;
     struct xml_attribute *attribute;
@@ -8647,7 +8646,8 @@ worksheet_write_boolean(lxw_worksheet *self,
  */
 lxw_error
 worksheet_insert_checkbox(lxw_worksheet *self,
-                          lxw_row_t row_num, lxw_col_t col_num, int value)
+                          lxw_row_t row_num, lxw_col_t col_num,
+                          int value)
 {
     lxw_cell *cell;
     lxw_error err;
@@ -9917,8 +9917,7 @@ worksheet_add_sparkline(lxw_worksheet *self, lxw_row_t row, lxw_col_t col,
     char location[LXW_MAX_CELL_NAME_LENGTH];
 
     if (!user_options) {
-        LXW_WARN
-            ("worksheet_add_sparkline(): options parameter cannot be NULL");
+        LXW_WARN("worksheet_add_sparkline(): options parameter cannot be NULL");
         return LXW_ERROR_NULL_PARAMETER_IGNORED;
     }
 
@@ -9985,7 +9984,7 @@ worksheet_add_sparkline(lxw_worksheet *self, lxw_row_t row, lxw_col_t col,
 
     sparkline->weight = user_options->weight;
     if (sparkline->weight == 0.0)
-        sparkline->weight = 0.75;       /* Default line weight */
+        sparkline->weight = 0.75;  /* Default line weight */
 
     if (user_options->date_axis) {
         sparkline->date_axis = lxw_strdup(user_options->date_axis);