 Usage:  {gamma, mu, sigma} = mlegp(x, k)  
 
 Input:

  x                      vector 
                         
  k                      integer, number of upper extremes 
                         
 Output:

  gamma                  scalar, estimated shape parameter 
                         
  mu                     scalar, estimated location parameter 
                         
  sigma                  scalar, estimated scale parameter 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
