-- Fit to double Gaussian resulted in 
GPampl = 0.000000000882566
GPmu   = 0.049154559838280
GPsigma  = 0.005397389559085
GPmu2    = 0.349885658198034
GPsigma2 = 0.005548576077126
-- Parameters found for 
function refFunction( x ) 
   return 1 + GPampl * math.exp(-((x-GPmu)/GPsigma)^2) + GPampl* math.exp(-((x-GPmu2)/GPsigma2)^2) 
end
