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    Computes the Doppler velocity correction, in case it was not  taken into
    account  at  the  time of observing.  The LO2 frequency in the header is
    assumed to be the frequency actually used.  A warning   is   issued   if
    the  LO1  frequency in the header is not coherent with the LO2 frequency
    (which means the phase tracking might be in error, since  it  uses  that
    LO1 frequency).

    The  frequencies  and line names introduced by SET FREQUENCY are used to
    define the velocity scales for each subband/sideband.

Gildas manager 2014-07-01