 Usage:  gl = grlinreg2 (x, {n, {col}})  
 
 Input:

  x                      m x 3 matrix 
                         
  n                      2 x 1 matrix 
                         
  col                    color 
                         
 Output:

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