Copyright, 1985-2005 by the Regents of the University of California. This software product was produced under U.S. Government contract W-7405-ENG-36 by Los Alamos National Laboratory, which is operated by the University of California for the U.S. Department of Energy. Neither Los Alamos National Laboratory, nor the U. S. Government, nor the University of California makes any warranty, express or implied, or assumes any liability or responsibility for the use of this software.