protected double computeFactor(double omega,double sigma){
  double root=Math.sqrt(Math.pow(2.0,1.0 / omega) - 1);
  return 2.0 * root / sigma;
}

protected double computeFactor ( double omega , double sigma ) { double root = Math . sqrt ( Math . pow ( 2.0 , 1.0 / omega ) - 1 ) ; return 2.0 * root / sigma ; }
computes the factor for curve - fitting ( see equation ( 13 ) in paper )
