1 UV_SUBTRACT
        UV_SUBTRACT:  "Self"-Calibration of a UV data set

    UV_SUBTRACT subtracts a time average continuum UV table from a  spectral
    line  one,  typically  to  provide  continuum-free  spectral  line maps.
    Caution: it will not work  if  the  continuum  source  is  too  complex,
    because of the time averaging.

2 UV_TABLE$
        TASK\CHARACTER "Output UV table" UV_TABLE$

    UV table from which a continuum must be subtracted.
2 SELF$
        TASK\CHARACTER "UV table used as continuum" SELF$

    Gaussian source reference UV table
2 DTIME$
        TASK\REAL"The smoothing time constant in seconds" DTIME$

    Integration time to derive continuum value. Signal  to  noise  MUST   BE
    SUFFICIENT  not  to  add  noise  in  the  spectral  line  UV  table. But
    integration time should be short enough to  avoid  smearing  of  spatial
    features..ti -4 2 WCOL$
        TASK\INTEGER "The continuum channel" WCOL$

    If the reference SELF$  is  a   spectral   line   UV   table,   spectral
    channel to be used to define the continuum.
2 SUB$
        TASK\REAL "Fraction of the continuum source to subtract" SUB$

    Typically 1 or 0, to remove or not the continuum source.
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