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LAS\SPECTRUM [Yoff] [/INDEX] [/OBS] [/PEN Ipen]
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.
Plots the 2D array from the last LOAD command.
Without option, the behavior depends on SET ACTION (see PLOT). Default