SUPPORT

        [CLEAN\]SUPPORT [Polygon] [/CURSOR] [/PLOT]

    Define the support function for CLEAN components. Calls command  POLYGON
    of GREG to do that. See HELP POLYGON for details.

    With option /CURSOR, it calls the  interactive  cursor  to   define  the
    polygon   summits.   Type any key to go to next summit, D to correct the
    last one and type E to end the polygon  definition.  The  last   polygon
    side  will  then appear. The polygon definition may be aborted by typing
    Q. For X11 displays, you may use the mouse  buttons  for  the  commands.
    The  left  mouse  button draws a vertex, the middle mouse button deletes
    the  last  vertex,  and   the  right  mouse  button  ends  the   polygon
    definition.