 Usage:  plotcart2(x,tree{,xname})  
 
 Input:

  x                      n x p, X-variables used in cartsplit 
                         
  tree                   list, result of cartsplit 
                         
  xname                  textmatrix, names of the variables (optional) 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
