MODIFY DOPPLER

        CLIC\MODIFY DOPPLER

    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.