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    Compute  radial  visibility profiles averaged on regularly sampled angle
    intervals around the UV plane center.  The results is output  in  a  4-D
    GDF file ordered as:

      - Axis 1: Radial points;
      - Axis 2: Azimuth angles;
      - Axis 3: Frequency channels;
      - Axis 4: Amplitude, phase and weight.

    This task may be used to check circularity on a source which is centered
    on the phase reference.

Gildas manager 2018-06-20