MODIFY ELEVATION_GAIN
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MODIFY ELEVATION_GAIN

            LAS\MODIFY ELEVATION_GAIN

        Correct the spectrum for elevation gain losses as a function of frequen-
        cy and elevation. This is valid for point sources. For extended sources,
        the correction is less, depending on the size of the source.

        The rest frequency and elevation are taken from the spectrum header, as-
        suming  that  the  gain  stays  constant over the entire bandpass of the
        spectrum.

        This correction is only implemented for 30M data. The formulae  for  the
        gains  are documented in Juan Penalver memo 16-Apr-2012. The gain is the
        ratio of aperture efficiency at the elevation of the observation, divid-
        ed by the maximum aperture efficiency near 50 degrees.