## Plotting Spectra

Plotting spectra is controlled by several parameters:

- SET UNIT Type defines the unit of the X axis, which may be C (for Channel number), V (for Velocity), F (for Frequency) or I (for Image).
- SET PLOT Type defines the plotting type PLOT (Normal or Histogram); Normal gives straight lines connecting the data points (this is the default since it is faster). Histogram gives a more realistic representation of spectroscopic data.
- SET MODE X (or Y) Type defines the plotting limits in X or Y, where type stands for TOTAL (all channels plotted in X, complete scale in Y), AUTO (take the plotting limits in use when the spectrum was last written), or two numbers for fixed limits; X or Y specify the axis on which the type is to apply. For X axis, the limits are in the current units (C, V or F). For F, specify the offset from the rest frequency in MHz (note: the caption and the numbers on the axis will refer to absolute rest frequencies).

Subsections

- Single spectrum
- Spectra map
- Large set of spectra