Keywords: class

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### Single spectrum

Single spectrum are usually plotted using the following commands:

- `BOX`, which plots the frame. The Y axes are labelled in temperature units; the X axes may be in the following units: Velocity, Frequency, Image frequency, or Channel number. The upper X axis may be labelled in a different unit than that of the lower axis. Units for both axes are entered by the command `SET UNIT` `L U`, where L and U stand for the units of lower and upper axes and may be any of V, F, I, or C. The second parameter U is optional; if not entered, it defaults to L.

  `BOX` accepts the option `/UNIT` which specifies a unit temporarily different from the current one (given by the `SET UNIT` command). The parameter `UPPER` will modify only the unit for the upper axis of the frame. For instance: `BOX /UNIT F UPPER` will give velocities on the lower axis (if this is the current unit specified by `SET UNIT V`) and rest frequencies on the upper axis.

- `SPECTRUM`, which plots the spectrum, in the current mode, clipped into the current box. An offset may be given as argument to plot two spectra above each other for comparison.
- `TITLE`, which writes a header above the frame. The title format is controlled by the `SET FORMAT` command.
- `PLOT`, which performs all of `CLEAR; BOX; SPECTRUM; TITLE` in a single operation.

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