Errors can be mapped on the colours
                                                                       
      zone 2 2                                                                                                          
      fun2 2 x**2*y 20 -1 1 20 -1 1 ' '                                                                                 
      fun2 3 sin(x)*cos(y) 20 -6 6 20 -6 6 ' '                                                                          
      h/plot 2 surf1                                                                                                    
1     H/PLOT 2 SURF1,E                                                                                           
      zone 1 2 2 s                                                                                                      
2     V/CR ERR(400)                                                                                              
2     GET/CONT 3 ERR                                                                                             
2     PUT/ERR 2 ERR                                                                                              
2     H/PLOT 2 SURF1,E,Z                                                                                         

1. 2D histograms can be plotted with errors. With options, like SURF1, in which colors are involved, the errors are mapped onto the color map.
2. By default the errors on a histogram are the square root of the content. It is possible to define the errors with the command PUT/ERR .