Rectangular Range Selection
There is the following ways in rectangular range selection.
Rectangular Selection by Mouse
Rectangular Selection by Keyboard
It becomes a rectangular range selection mode by Shift+[F6], and the range of the rectangle is changed by a usual cursor movement.
The rectangular range selection mode can be canceled with the [Esc] key.
Hint
Alt+[Up], Alt+[Down], Alt+[Left], Alt+[Right] become the rectangular range selection modes.