Calculation is by C.S.Zhang. The difference at the low energy region would tell us that we need complete 3 dimensional calculations because the shadowing by the earth surface destroies the symmetry around the input incident angle. The primary is 50 GeV photons. The points compared with App. The primary is 500 GeV photons.
Low ones are interal energy spectra.
The primary is 500 GeV protons. Low ones are interal energy spectra.