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Set a Chart Element's Outline
You can make a chart element stand out by customizing the element's outline, which refers
to the border that appears around the element, as well as to single-line elements, such as
gridlines and axes. You can customize the outline's color, its weight — that is, its
thickness — and whether the line is solid or consists of a series of dots or dashes.
Click the chart element you want to format.
Click the Format tab.
Click the Line arrow in the Chart Element Styles.
Click the color you want to apply.
Click the Line arrow.
Click Weights.
Click the line thickness you want to apply.
Click the Line arrow.
Click Dashed.
Click the line style you want to apply.
Excel formats the element's outline with the color, weight, and style you selected.