UV_REF_GAUSS

        UV_REF_GAUSS  does  a Phase and/or amplitude referencing of a UV ta-
    ble, using another one representing a Gaussian source observed quasi-si-
    multaneously.  In details:

       - UV_REF_GAUSS self-calibrates first  the observed visibilities of the
         Gaussian  source used  as reference,  based  on the  knowledge of  the
         geometry and  flux of this  source.  The self-calibration  is baseline
         based (i.e. it does not take into account closure relationships).
       - UV_REF_GAUSS   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_GAUSS enables  to
    subtract (part of) the input reference source, typically to provide con-
    tinuum-free spectral line maps.

    See also UV_REFPOINT or UV_REFDEL, which does the same thing, but  using
    a point or modeled source as input.