The command  SORT
                                                                                         
      hi/file 2 cwn_aptuple.hbook                                                                                       
      zone 1 3                                                                                                          
1     NTUPLE/PLOT 11.DIVISION                                                                                    
2     SORT 1000000 XD                                                                                            
3     H/PLOT 1000000                                                                                             
2     SORT 1000000 XV                                                                                            
3     H/PLOT 1000000                                                                                             

1. Create the histogram 1000000. This is an histogram with character labelling.
2. Reorder the labels according to the option.
3. Plot the histogram 1000000 with reordered labels.