SPECTRUM

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

    /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). The op-
        tion /PEN allows to use a custom pen.

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

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