CR fluxes in a GMC with a gas H mass of M_H = 10⁵ M_⊙. Top panel: CR fluxes at different radii penetrating into a GMC with a dimension of 20 pc, assuming there are no sources inside it, for three different diffusion exponents: δ = 0.5 (solid lines), 0.3 (dashed lines), and 0.7 (dotted lines). The spatial diffusion coefficient D₀ = 4 × 10²⁶ cm²/s. The gas density profile index α = 2, and the core radius R_c = 0.5 pc. A fraction of the gas helium, whose abundance relative to H is n_He/n_H = 0.0925, is also included. Bottom panel: same as the top panel, but the spatial diffusion coefficient D₀ = 4 × 10²⁸ cm²/s.