FUNCTION/DRAW
                                                                                            
      zon 2 2                                                                                                           
1     FUN/DRAW X**2+Y**2+Z**2=1                                                                                  
2     RANGE 0 1                                                                                                  
1     FUN/DRAW X**2+Y**2+Z**2=1                                                                                  
2     RANGE 0 1 0 1                                                                                              
1     FUN/DRAW X**2+Y**2+Z**2=1                                                                                  
2     RANGE 0 1 0 1 0 1                                                                                          
1     FUN/DRAW X**2+Y**2+Z**2=1                                                                                  

1. This command draws a sphere of radius 1. The function can be also a COMIS program.
2. The command RANGE modify the X, Y and Z range in which the function is drawn.