  save (overlay) (filename)

  "save" stores the objects from the specified overlay into the named
file.  Valid overlays may be: 0, red, 1, green, 2, blue, 3, yellow.

Examples of SAOimage style objects:
BOX   300  200  100 50  : draws a box centered at pixel 300,200 that
			  is 100 pixels wide, and 50 pixels high

CIRCLE 500 400 200 : draws a circle centered at pixel 500,400 with a
                     radius of 200 pixels

LINE 100 100 200 200 : draws a line from (100,100) with length (200,200)

  See also: load, erase, contour

