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In Excel, as shown in the figure below, you can change the color of the chart series by setting the theme color.

Using Aspose.Cells API, you can also set the theme color for the chart series.
The following sample code loads the sample Excel file and generates the output Excel file.
In this sample code, ChartColorPaletteType.MonochromaticPalette6 indicates the use of the sixth theme color in the drop‑down box in the Excel interface.
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