PSRCHIVE documentation: psrplot looping over data dimensions

Some plots support specification of an index along a certain dimension of the data to be plotted. For example, the simple flux plot supports specification of the subint, chan, or pol of the profile to be plotted.

psrplot can loop over one or more of these dimensions, producing a new plot at each step in the loop, using the -l index=range command line option one or more times. For example, 

psrplot -p flux -l pol=2,3 -l chan=11-15,63- filename.ar
will plot the pulse profile from polarizations 2 and 3 for each of the frequency channels from 11 to 15 (inclusive) and from 63 to the last channel. The index specified first will be the most rapidly changing from plot to plot.