The model does not include scattering angle lower than 30 degrees because the differential cross section dwarfed other data points for it to be studied. The likely explanation is that the incident photons were not blocked well enough. Otherwise, it can be seen that experiment agrees much closer to Klein Nishina prediction than the Thompson's as the scattering angle increases. \(\chi ^{2}\) for Klein Nishina is also much smaller, generally around 0.2 for the most points, while the \(\chi^{2}\) for the Thompson are at the level of 1 to 2.