The author would like to thank Rob Goldston for his support of the development of CUPLOT and for many suggested improvements. Thanks to all the PPL users who have contributed helpful requests and comments. Finally Norm Fromm set up a CUPLOT course which was the basis for this document, and Ben Stiles converted it from a Macintosh document to TEX.
This work was supported by the United States Department of Energy under contract DE-AC02-76-CHO-3073.