Keywords: class

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### Large set of spectra

An efficient way to look at a large set of coherent spectra (e.g. observed in OTF mode) is to plot them as a 2-D image where the intensity is colour coded. The image is formed by applying the `LOAD` on the current index. Then the `/INDEX` option modify the single spectra plotting commands as follow:

- `BOX /INDEX`, which plots the frame, i.e. the entry number (Y axis) as a function of the velocity and/or frequency (X axis). The ranges of X and Y axes are controlled by the `SET MODE` command. `SET MODE Y` always control the intensity range.
- `SPECTRUM /INDEX`, which plots the image.
- `TITLE /INDEX`, which writes a header above the frame. Range of parameters (e.g. scan number, beta and lambda offsets, ...) are written.
- `PLOT /INDEX`, which performs all of `CLEAR; BOX /INDEX; SPECTRUM /INDEX; TITLE /INDEX` in a single operation.