UV_FILTER /FREQUENCY

        [CLEAN\]UV_FILTER  [/RESET]  [/ZERO]  /FREQUENCY  F1  [... [Fn]] [/WIDTH
    Width]

    Specify around which frequencies the line emission should be filtered.  Fre-
    quencies F1 to Fn must be in MHz. The full width  of  the  filtering  window
    around  every  frequency can be set by option /WIDTH.  The optional argument
    TYPE indicates the type of width: FREQUENCY (in MHz), VELOCITY (in km/s)  or
    CHANNEL  (no  unit),  the default being FREQUENCY.  The default width is the
    current channel width.

    Tip: it can be convenient to have a list of  SIC  variables  containing  the
    frequencies of the most intense spectral lines, e.g.
            HCO10 = 89188.52