Two-dimensional histograms representations

Different representations of two-dimensional histograms
      histogram/file 1 pawhists.hbook
      zon 2 2
1     HI/PL 200 BOX                                                                            
1     CONTOUR 200 20 0                                                                         
1     LEGO 200                                                                                 
1     SURFACE 200                                                                              
      hi/del *

As we have already seen, the command H/PL allows to draw 2D histograms in different ways. Three additional commands are also available:
```
  * /HISTOGRAM/2D_PLOT/CONTOUR  [ ID NLEVEL CHOPT PARAM ]
  * /HISTOGRAM/2D_PLOT/SURFACE  [ ID THETA PHI CHOPT ]
  * /HISTOGRAM/2D_PLOT/LEGO     [ ID THETA PHI CHOPT ]
```
These commands have more parameters than HIS/PLOT . For example CONTOUR allows to specify a set of levels to be drawn via the parameter PARAM (see next example).
Note that it is also possible to have 1D histograms represented as lego or surface plots. For example you can do: HI/PLOT 110 LEGO .

			PAW Tutorial	Last update: 1999/04/01 14.58	Olivier.Couet@Cern.Ch