Hi, I've been searching on google for minutes but couldn't find out a consistent way so far. I mean, it seems everybody has something to say about it :) My data consists of pixel values (ADU's). I am writing a script to obtain fwhm of seeing disk. By definition of the gaussian curve, i should only calculate the standart deviation of these values theni get fwhm=stdev*2.355 . Am I correct? Or should i obtain a gaussian fit then i calculate fwhm as its name suggests? Thanks in advance, bugra
If you do it both ways, and the answers are different, what does that tell you about the fitting algorithm that you used?