degrees of freedom    (FIT_NDF)                        : 306
rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 0.0235506
variance of residuals (reduced chisquare) = WSSR/ndf   : 0.000554633

Final set of parameters            Asymptotic Standard Error
=======================            ==========================

a               = 0.2              +/- 0.006646     (3.323%)
b               = 1.55881          +/- 3.221e-05    (0.002066%)
c               = 0.599999         +/- 0.00227      (0.3783%)
d               = 8.62046e-07      +/- 4.657e-08    (5.402%)


correlation matrix of the fit parameters:

               a      b      c      d      
a               1.000 
b               0.794  1.000 
c               0.552  0.454  1.000 
d              -0.356 -0.258  0.355  1.000 

sigma = √(d/2)
FWHM = 2.3548 sigma = 0.0015459813476073766
FWHM range = [0.0015036426000095634:0.0015871910993123417]