 Usage:  bp = grandrews (x, nt {, col})  
 
 Input:

  x                      n x p matrix 
                         
  nt                     scalar number of gridpoints in [-pi,pi] 
                         
  col                    color 
                         
 Output:

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