Screen Cap: https://0x0.st/i1zI.png of Fig. 4.4 from: https://scholarworks.uark.edu/etd/2456/ Look how horrible these _published_ fits are! This is a U of A certified Physics PhD, in fact, certified by the two people whose sole decision it was to make me a victim of the March purge, against the best wishes of my committee. The histograms themselves are asymmetric, but the fit function is a symmetric Gaussian. Instead of rushing ahead to incorrectly repeat standard blah-blah-blah, if that's all they can do after so many years, looks like the author needs to stop and ask "WTF?" or "What's The Function?" If the author is still ignorant to this day, maybe it would be a good idea to study the recently released "Summer Insect Pandemics": https://demonstrations.wolfram.com/SummerInsectPandemicsInTheUnitedStates/ Sorry, but this is much better data analysis, which accounts for asymmetry. It's not even for a PhD, it's just for fun and to cope with stress of being treated like an insect by these "big shot" faculty members! --Brad PS. Where are the error bars on extracted parameters? What about covariance? etc. etc...