Spectra of pion decay (top), Bremsstrahlung (middle), and inverse-Compton (bottom) emission for a star-forming disk galaxy with (R_max, z_max) = (10 kpc, 2 kpc) and a 4−6 kpc ring distribution of molecular gas. The solid, dashed, and dot-dashed curves correspond to n_H2 = 5, 50, and 500 H₂ cm^-3, respectively. For the leptonic processes, the contribution from primary electrons and secondary positrons are shown. In all plots, the total γ-ray emission from all processes and all particles is shown in black.