VIEW Keywords:

        VIEW recognizes the following keywords
      BEAM        Synthesized beam(s)
      CCT         Clean Cumulative Flux
      CLEAN, DIRTY, SKY   Usual sky maps
      NOISE       per channel noise
      PRIMARY     Primary beams
    or any other 3-D SIC variable.

    VIEW falls back to SHOW for un-recognized keywords, such as MOMENTS, COMPOS-
    ITE, UV, etc...