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qdel

       'qdel' RETURN 'w'|'a'|'i'|'r'|'p'|'l'|'s'|'b'|'S'|'L'|'q'

This keyword is used to delete entities (see also del). Higher entities (depending ones) will be deleted to. To delete more than one entity with one stroke, type ``a'' before and create a rectangular picking area by pressing two times the ``r'' key. Both strokes define opposite corners of the rectangle. To delete only one entity type ``i'' before. Press ``q'' to quit the command.

It is also possible to measure distances between two pixels on the screen. Just press the key ``w'' on the positions of the two pixels. The distance is calculated in the scale of the displayed geometry.