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Overlay (in contours) the specified Channel of the SIC 2 or 3-D Variable. The default Variable is CONTINUUM, the continuum image. If Variable is a 3-D SIC Variable, Channel indicates which plane is overlaid (default: last one). The /OVERLAY option de-activates the contouring of the Argument data, by temporarily setting DO_CONTOUR to NO.
In addition to this overlay, the user can add any display on the
channel maps by a command to be executed through the OVERLAY_COM variable.
This command can be the execution of a script, e.g.
LET OVERLAY_COM "@ draw_my_markers"
or
LET OVERLAY_COM "@ p_beam clean"
to plot the clean beam.
Note that this variable is not defined by default, so must be defined
DEFINE Char*80 OVERLAY_COM /GLOBAL
when needed