 Usage:  fh = grash (x, {h, {k, {col}}})  
 
 Input:

  xr                     n x 1 vector 
                         
  h                      scalar binwidth 
                         
  k                      scalar number of shifts 
                         
  col                    color 
                         
 Output:

  fh                     composed graphical object 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
