Specify or modify some information in internal buffers, or a Sic Image Variable, or Gildas Data File.
If the first argument is a * (or is omitted), SPECIFY will apply to all relevant internal buffers (CLEAN, CONTINUUM, DIRTY, UV, SHORT, ...)
If the first argument contains a . (the separating character between a file name from the file type), it is assumed to be a filename.
Otherwise, it should a SIC IMAGE variable or a recognized buffer.
Recognized values for Keyword are: BLANKING, FREQUENCY, LINENAME, VELOCITY, SPECUNIT, TELESCOPE, UNIT.