### 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.