If your chart includes only one series and several categories, then by default individual chart segments will use the same fill color (such as individual columns in a column chart) or varying colors (such as segments in a pie chart), depending upon the chart type you are working with. For all charts, you can always change the color of the entire series but that works best if you have multiple series in your chart. The same is not true for a chart that has only one series — in that case displaying all individual elements of a chart series in the same color can make your chart look dull — it also does not provide a proper way for your audience to compare the individual series’ elements. PowerPoint 2011 lets you resolve this limitation by using the Vary color by point option.
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