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    Compute the receiver gain ratio (Image Side Band over Signal Side  Band)
    from  correlation  data  on a continuum source. Compute also the LO1 and
    LO3 phases that should be used in real time to have zero phases in  both
    side  bands  (DSB receiver up to 2006), or the relative phases between H
    and V polar (SSB dual-polarisatoin receivers)

    The data from all the scans in the current index are averaged except  if
    optional  argument SCAN is given, in which case the gain ratios are com-
    puted for each scan.

    Option /PRINT produces a procedure INTER_OBS:gain.obs to set  the  gains
    (and phases) in OBS.

    Option /OFFSET allow to only compute the phases, not the gain ratio.

Gildas manager 2019-01-23