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 Algorithmen zur grafischen Darstellung einer Funktion z = F(x,y).         
                                                                           
 Version 1.0                                                               
                                                                           
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 Copyright (C) 1991, Hans-Jrgen Herrler und Dieter Sosna                  
                     Universitt Leipzig                                   
                     Augustusplatz 10                                      
                     O-7010 Leipzig                                        
                     Germany                                               
                                                                           
 This software may be freely copied, modified, and redistributed,          
 provided that this copyright notice is preserved on all copies.           
                                                                           
 There is no warranty or other guarantee of fitness for this software,     
 it is provided solely "as is".  Bug reports or fixes may be sent          
 to the authors, who may or may not act on them as they desire.            
                                                                           
 You may not include this software in a program or other software product  
 without supplying the source, or without informing the end-user that the  
 source is available for no extra charge.                                  
                                                                           
 If you modify this software, you should include a notice giving the       
 name of the person performing the modification, the date of modification, 
 and the reason for such modification.                                     

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