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Charts help present developments and statistics in a striking and comprehensible way. In the implementation of a graphic, the chart style that most easily and unmistakably reflects the content should be selected. Two presentation options are available for this: Pie charts and bar charts.
You should restrict the use of colors.
If the chart is a key visual, use one color.
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If necessary, use one color for highlighting.
In the pie charts, color-code categories.