UV_SPLIT /FREQUENCY

        [CLEAN\]UV_SPLIT [Degree [Compress]] /FILE FileIn [FileLine [FileCont]]
        /FREQUENCY F1 [... [Fn]] [/WIDTH Width]

    Specify around which frequencies the line emission should  be  found.   Fre-
    quencies  F1 to Fn must be in MHz. The full width of the 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 chan-
    nel 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