MODIFY

        [SIC\]MODIFY VarName|GDFName [/FREQUENCY Linename RestFreq] [/VELOC-
    ITY Velocity] [/SPECUNIT FREQUENCY|VELOCITY]

    Modify consistently the spectroscopic axis of a lmv cube or a Sic struc-
    ture of type IMAGE, HEADER, or UVTABLE.

    The spectroscopic axis can be changed to the alternate unit with the op-
    tion /SPECUNIT. By default, the unit is unchanged.