While it may seem that having a program that adds noise to seismic data is counterproductive, it is often useful for testing purposes to have the capability of simulating noise.
It is also useful for demonstration purposes, and many of the demos below use suaddnoise to ``fill in the blanks'' in the suplane testpattern. A couple of examples of the output of this program, using suplane data
% suplane | suxwigb title="no noise" & % suplane | suaddnoise | suxwigb title="noise added" & % suplane | suaddnoise sn=2 | suxwigb title="noise added" &