BEAM

          SHOW BEAM [PLANE|FIELD Kn] [First Last]

    Show some sub-cube of the (up to 4-D) dirty Beam.

    The  2nd  argument  indicates whether SHOW shows all Fields for a given fre-
    quency plane (PLANE keyword), or all Frequency-dependent beams for  a  given
    Field. The 2nd and 3rd arguments are optional if the beam is only 3-D, which
    occurs  for a single field or a frequency-indepedent beam in Mosaics (narrow
    band approximation).