 Usage:  deletedata(di, l_num, c_num, da_num)   
 
 Input:

  di                     Display 
                         
                         
  l_num                  integer, 1 ... count of lines of di 
                         
                         
  c_num                  integer, 1 ... count of columns of di 
                         
                         
  da_num                 integer, 1 ... count of plotted datasets 
                         
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
