VARIABLES SPW

        CLIC\VARIABLES SPW ON|OFF

    Spectral window parameters.
      SPW%NSPW
      SPW%NAME  [NSPW]  Spectral window name
      SPW%TOPO  [NSPW]  Spectral window topocentric ref frequency (MHz)
      SPW%FREQ  [NSPW]  Spectral window rest frequency (MHz)
      SPW%BW    [NSPW]  Spectral window bandwidth (MHz)
      SPW%POL   [NSPW]  Spectral window polarisation (1:H, 2:V)
      SPW%SB    [NSPW]  Spectral window sideband