Image maps (a.k.a. active/hot regions) are visual areas within the chart that allow you to define interactive areas within an image. They can be used for drill-down, displaying tool tips, or for determining which portion of the chart was clicked. The image map areas can appear for many of the chart UI elements, including labels, chart series items, titles, etc.
Image maps can be also used to implement Drill-Down user interfaces, whereby a subset of data is displayed when the user clicks on a data point or corresponding legend item.
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