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).