Geant4 testDoubleExpREADME This test checks a second implementation of the empirical model for proton atomic shell cross section, implemented in G4hShellCrossSectionExp and G4hShellCrossSectionExpData classes, with the implementatiotion of two new classes: G4hShellCrossSectionDoubleExp and G4hShellCrossSectionDoubleExpData. Like the first model, this test asks to the users the Shell Number. Since the model is implemented only for the k shell, the shell number must be 0. The test prints on the desktop the atomic number, particle incident energy and atomic cross section for each elemet with Z > 5.