select cursor and box.
The three mouse buttons have been redefined as:
LEFT - moves the center
of the box to the position of the arrow point.
MIDDLE - sizes the box. Horizontal and vertical size can be done independently.
RIGHT - rotates the box.
A box will appear centered with the circle. Position the
arrow at the desired location and click on the LEFT button.
size the box by holding the MIDDLE button and dragging the mouse
both horizontally and vertically to define the two dimensions of the
box. Release the button to fix the size of the box.
save the results by typing `s' while the mouse is in the display
window.
select region and write, to write the saved regions into a file
for later use (as above).
