/*
 * Copyright (C) 1987, 1989, 1990, 1992, 1993 Robert Lupton and Patricia Monger
 * 
 * This programme is not public domain, except where specifically stated
 * to the contrary, either in the code, or in the manual. If you have a
 * legally acquired copy you may use it on any computer "on the same site",
 * but you may NOT give it away or sell it.
 * 
 * There is no warranty for this code, and we accept no responsibility.
 * If you find any bugs, or wish to suggest any enhancements, please send
 * mail to one of the authors (monger@mcmaster.ca or rhl@astro.princeton.edu).
 */