I read this on OriginPro's Help Website: For peak-fitting curve Asym2Sig, " Parameters. Number: 6. Names: y0, xc, A, w1, w2, w3. Meanings: y0 = offset, xc = center, A = amplitude, w1 = full width of half maximum (FWHM), w2 = variance of low-energy side, w3 = variance of high-energy side".
Let's say I am fitting a dataset with arbitrary units (a.u.) in x- and y-axes. Now, when I use Asym2Sig, the parameter values that were obtained seemed too off than what they should be; specifically, the FWHM value (w1) which came ~18 units, while it clearly should be somewhere around ~35-40 units.
Even the value of Amplitude (A) is calculated as ~(minus) 1/46E-24 a.u. while it must be ~ (minus) 6 or 7 units.
Would appreciate clarification regarding the same. A reference image (of original plot and fitted plot and parameter values) is attached as well. Thank you.