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        UV_REF_MODEL  does a Phase and/or Amplitude self-calibration of a UV
    table, another observed UV table for which a correct model is known.  In

       - UV_REF_MODEL self-calibrates first  the observed visibilities of the
         modeled source  used as  reference.  The self-calibration  is baseline
         based (i.e. it does not take into account closure relationships).
       - UV_REF_MODEL   then   applies   the   gains  derived   in   previous
         self-calibration to the visibilities of the source to be calibrated.

    It  is  STRONGLY ADVISED to self-calibrate the phase first, then the am-
    plitude using a longer smoothing time.  Moreover UV_REF_MODEL enables to
    subtract (part of) the input reference source, typically to provide con-
    tinuum-free spectral line maps.

    See also UV_REF_POINT, UV_REF_GAUSS, which does the same thing, but  us-
    ing a point and a Gaussian source as input.

Gildas manager 2020-04-01