Gamma-ray >100 MeV luminosity versus total number of hydrogen atoms (top panel) and star formation rate (bottom panel) for Local Group galaxies and the starbursts M 82 and NGC 253. In the bottom panel, the lines are power-law fits to the data for the MW, M 31, the LMC, and the SMC, for which the slope was free (solid) or fixed to 1 (dashed).
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