The Graph item comes with built-in palettes, and you can define additional custom palette. These palette colors also appear in the legend. When multiple series are added to the chart, the chart assigns the series a color in the order that the colors have been defined in the palette.
If there are a greater number of series than there are colors in the palette, the chart will begin reusing colors, and two series may have the same color. To avoid confusion, define a custom palette with at least the same number of colors as you have series on your chart.
For more information on how to define a custom color palette, please refer to Formatting Series Colors
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