The legend matches line color to the data series associated with the chart.
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Click an item in the legend to highlight its series in the chart. (Click the item a second time to return the series to its normal appearance.)
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Move the mouse pointer over an item in the legend to view the current value for that series within the chart.
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Arrows at the top and bottom of a legend (if displayed) indicate that there are more items in the legend list. Click an arrow to scroll through the list.