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At the top right of the map view, there are a few simple controls:
Modifying the calendar will change the size and color of the different sites based on their respective values during the selected periods.
Selecting the clock icon will open up the animated timeline which you can play and see the changes as they happened over a set period of time.
The timeline settings offer more control over the playback speed and timeline range:
Selecting the wrench icon will bring up the tree map configuration window.
