Mouse actions in LASCO Image Display:

MAIN WINDOW:
    While moving cursor in main window:
    Click or press left mouse button to update ZOOM WINDOW.
    Click or press middle mouse button to change gamma correction.
    Click or press right mouse button to stretch bottom.

ZOOM WINDOW:
   The default zoom factor is 4.
   Click on left (right) mouse button to increase (decrease) the zoom
   factor by 1.
   Press and move left (right) mouse button to increase (decrease) the
   zoom factor.
   Click on middle mouse button to get a new zoom window in size 512x512.

FULL FRAME WINDOW:
   The size of the MAIN WINDOW is 1024x1024. The visible are is 640x512
   pixels.
   Full frame window is the MAIN WINDOW resized to size 128x128.

   Click or press left mouse button to update the ZOOM WINDOW.
   Click or press middle mouse button to change the visible area of the
   MAIN WINDOW.

PLOT WINDOW:
   Click on left mouse button for a plot from left to right.
   Click on middle mouse button to call the WPLOT program. 
   Click on right mouse button for a plot from bottom to top.