The Assembly Overview shows a coverage overview of the assembly. The longer the depth of a line in the overview and the deeper the color, the more reads are located in this region.
To open a region of the assembly in the Reads Area click on it in the Assembly Overview. On the overview, the selected region is displayed either as a gray rectangle, a red cross or a red rectangle. For example:
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To learn about available hotkeys refer to Assembly Browser Hotkeys.