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Note:
If longitudinal profile data is displayed in the spatial display, then there is no need to draw a profile sketch. Just press the F2 key or right click and select 'Show Profile' from the pop-up menu to show the graph of the profile. 
Extracting data for an area from a grid time series (available since build 18645)
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When animating the grid display, a marker will move over the time series graph as well. Note that the same area sketch can be reused when switching to another plot (right clicking and selecting one of the relevant options will open a new window). 
Note:
Even more essential then for scalars, it is wise to pause the grid animation when dragging an area for extracting data.
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