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Pie charts, bar charts, line graphs and bubble charts that show you multiple categories often allow you to select/deselect certain categories to focus in on subset. To do so, simply click on the category in the charts legend.
Certain Bubble charts allow you to focus in on part of the graph by using the mouse to select the top left most grid point of the area you would like to focus in on, holding the left mouse button down and drawing it to the bottom right grid point you would like to focus in on. Releasing the mouse there. This will concentrate the graph in on the selected area.
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