SPECTRUM

        LAS\SPECTRUM [Yoff] [/INDEX] [/OBS]

    /OBS
        Plots the spectrum in the R buffer in the units and  scales  defined
        by  SET  UNIT  and SET MODE. Yoff (default 0) is a constant Y-offset
        added to the plotted values (useful to compare two spectra).

    /INDEX
        Plots the 2D array from the last LOAD command.

    Without option, the behavior depends on SET ACTION (see  PLOT).  Default
    is OBS.