Perform operations on histograms read from file and save results
                                          
1     HISTOGRAM/FILE 1 PAWHISTS.HBOOK ! U                                                                        
      hrin  *                                                                                                           
      zon 2 2                                                                                                           
      opt grid                                                                                                          
      set mtyp 26                                                                                                       
      hi/pl 110 e                                                                                                       
      hi/pl 110 pl                                                                                                      
      zon 1 2 2 s                                                                                                       
2     HI/OP/ADD 110 110 120 0.5 0.                                                                               
      hi/op/add 110 110 130 0.25 0.                                                                                     
      set htyp 245                                                                                                      
      hi/pl 110                                                                                                         
      set htyp 254                                                                                                      
3     HI/PL //PAWC/120 s                                                                                         
      set htyp 253                                                                                                      
      hi/pl //PAWC/130 s                                                                                                
      text 0.55 95. 'LEP Very Preliminary' 0.35 25.                                                                     
      hrout 0                                                                                                           

1. The option `` U '' (for Update) in the command HIST/FILE , is used when the user wants to change the content of an existing histogram file by adding a new histogram ( HROUT ) or deleting an histogram ( HSCRATCH ).
2. It is possible to perform operations between histograms like addition with the commands in the menu HISTOGRAM/OPERATIONS .
3. The memory, like the attached files, can be considered as a directory. This is the current directory by default and //PAWC is its name. The command HI/PL //PAWC/id plots the histogram `` id '' in memory while the current directory is //LUN1 .

Some ``cosmetic modifications'' on PAWEX13
                                                                
      histogram/file 1 pawhists.hbook ! u                                                                               
      hrin  0                                                                                                           
      zon 2 2                                                                                                           
      opt grid                                                                                                          
1     SET *FON -60                                                                                               
2     SET BWID 4                                                                                                 
3     SET BCOL 1.5                                                                                               
      set mtyp 26                                                                                                       
      hi/pl 110 e                                                                                                       
      hi/pl 110 pl                                                                                                      
      zon 1 2 2 s                                                                                                       
      hi/op/add 110 110 120 0.5 0.                                                                                      
      hi/op/add 110 110 130 0.25 0.                                                                                     
      set htyp 245                                                                                                      
      hi/pl 110                                                                                                         
      set htyp 254                                                                                                      
      hi/pl //pawc/120 s                                                                                                
      set htyp 253                                                                                                      
      hi/pl //PAWC/130 s                                                                                                
4     SET CHHE .35                                                                                               
4     SET TANG 25.                                                                                               
4     ITX 0.55 95. 'LEP Very Preliminary'                                                                        
      hrout 0                                                                                                           

1. All the text fonts used for HISTO/PLOT are set to -60.
2. The line width for the boxes around the histograms is set to 4 pixels. Like for the fonts it is possible to do SET *WID to set all the width available in the SET command.
3. The color of the shadow around the histograms is set to 5 (Yellow), it appears grey on black and white PostScript printers.
4. To access hardware fonts (ie PostScript fonts) the command ITX and its related attributes should be used.