 Usage:  {mu, sigma} = fittail (gamma, t, sigmas, k, n)  
 
 Input:

  gamma                  scalar, shape parameter 
                         
  t                      scalar, truncation point 
                         
  sigmas                 scalar, scale parameter of exceedances 
                         
  n                      integer, total sample size 
                         
  k                      integer, number of exceedances 
                         
 Output:

  mu                     scalar, transformed location parameter 
                         
  sigma                  scalar, transformed scale parameter 
                         
--------------------------------------------------------------
(C) MD*TECH Method and Data Technologies, 17.8.2000
