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Fig. 4

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Photon spectral indices over 3 γ-ray bands for a star-forming disk galaxy with (Rmax, zmax) = (10 kpc, 2 kpc), 4 profiles of molecular gas, and 7 molecular gas densities for each profile (nH2 = 5, 10, 20, 50, 100, 200, 500 H2 cm-3). Blue, red, green, and purple curves correspond to the 500 pc core, 1 kpc core, 23 kpc ring, and 46 kpc ring gas profiles, respectively. Note that the energy bands differ from those used for the luminosities.

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