RESAMPLE SHAPE

    Four keywords are used to describe the frequency response of the synthe-
    sized channels:
    - TBOX  means  a  rectangular  function  in the delay domain, as for un-
            smoothed correlator channels (sin(pi.x)/(pi.x) in the  frequency
            domain)
    - TPAR  means  a parabolic function in the delay domain, as for smoothed
            correlator channels (smoothing function used at Plateau de Bure)
    - FBOX means a rectangular function in the frequency domain (as for fil-
            terbank channels)
    - FTRIANGLE  means a triangular function in the frequency domain (as for
            filterbank channels, Hanning smoothed)

    The shape of the input channels is derived from the backend number  read
    in  the  telescope  name  for IRAM-30m spectra: TBOX for autocorrelator,
    FBOX for other (filter) backends. Otherwise, rectangular filter channels
    are assumed.