 Usage:  {b,ctrl}=rlsbnorm1(e,Sigt,H,Q,N,eps,itmax)  
 
 Input:

  e                      numeric; efficiency loss to attain; 
                         
  Sigt                   n x n covariance matrix of the initial state 
                         
  H                      m x n matrix 
                         
  Q                      m x m variance-covariance matrix 
                         
  N                      integer; number of grid points for integration 
                         
  eps                    numeric; exactitude 
                         
  itmax                  integer; maximal number of iterations 
                         
 Output:

  b                      numeric clipping height achieving e as rel. effiency loss 
                         
  ctrl                   integer; 1 if error occurs 0 else 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
