 Usage:  a = hill(x,m)  
 
 Input:

  x                      (n*p) matrix 
                         
  m                      scalar 
                         
 Output:

  a                      p-vector giving for each column of x the inverse of the 
                         Hill estimate, i.e., the tail index 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
