* FUNCTION/FUN2 ID UFUNC NCX XMIN XMAX NCY YMIN YMAX [ CHOPT ]
                                            
      zone 2 2                                                                                                          
1     FUN2 10 ABS(SIN(X)/X)*(COS(Y)*Y) 40 -6 6 40 -6 6                                                           
      contour 10 40 0                                                                                                   
      hi/de 10                                                                                                          
      fun2 10 x*sin(x)*y*sin(y) 40 -10. 10. 40 -10. 10. CONT                                                            
      h/pl 10 surf4                                                                                                     

1. The command FUN2 allows to plot 2D functions and fill an histogram. The variables names are X and Y .
2. It is possible to represent a 2D histogram in several ways :
   1. As a scatter plot.
   2. With proportional boxes.
   3. With a color table.
   4. As a surface plot.
   5. As a surface with color levels.
   6. As a surface with a contour plot on top.
   7. As a surface with Gouraud shading.
   8. As a lego plot.
   9. As a lego plot with colours or shading.
   10. As a line contour plot.
   11. As a table.
   12. As an arrows plot.