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

    UV_ASCAL does a Phase and/or Amplitude Referencing of a  UV   Data  set,
    using    another   one   representing   a  point source  observed quasi-
    simultaneously.  It is  STRONGLY  ADVISED  to  self-calibrate  the phase
    first,   then   the   amplitude   using   a   longer   smoothing   time.
    UV_ASCAL allows in addition to subtract (part of) the  input   reference
    source, typically to provide continuum-free spectral line maps.

    See also UV_SELFCAL.

2 UV_TABLE$
        TASK\CHARACTER "UV table to be self-calibrated" UV_TABLE$

    UV table to be calibrated
2 SELF$
        TASK\CHARACTER "UV table used as phase reference" SELF$

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

    Integration time to derive correction.   Signal   to   noise   MUST   BE
    SUFFICIENT  TO IMPROVE the phase or amplitude determinations.  If DTIME$
    is too short, noise will be added to the data, rather than the  expected
    improvement.  Required values are
            S/N    =  11  for 5 degree phase noise
            S/N    =  20  for 5 % amplitude correction
2 WCOL$
        TASK\INTEGER "The phase reference channel" WCOL$

    If the reference SELF$  is  a   spectral   line   UV   table,   spectral
    channel to be used.
2 TYPE$
        TASK\CHARACTER "Type of self-cal, Ampli, Phase, Both or None" TYPE$

    It is recommended to  self-calibrate   the   phase   first,   then   the
    amplitude  using  a  longer  smoothing  time, rather than both together.
    Type NONE can be used just to subtract a time-smoothed  continuum  value
    from a spectral line table.
2 SUB$
        TASK\REAL "Fraction of the continuum source to subtract" SUB$

    Typically 1 or 0, to remove or not the continuum model.
1 END