Emissivities of γ-rays from interactions of Galactic CRs with the interstellar gas. Left panel: the overall γ-ray emissivity is shown by the solid line, while the emissivity due to pp interactions is shown by the dashed line. The red line corresponds to the pp emissivity enhanced by the factor of κ = 1.8 in order to match the overall emissivity at energies above 3 GeV. For composition and the CR proton flux are used the AMS measurements. Right panel: as in the left panel, except for the proton spectrum; it is assumed the same AMS proton spectrum at high energies but extrapolated to low energies as a single power-law with the same power-law index 2.85.