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Fig. 1

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Left panel a) SED of the γ-ray emission detected from GMCs in Table 2. For each cloud, the energy spectrum is normalized to its flux at 3 GeV to highlight the differences between the spectral shapes derived from different clouds. The spectrum averaged over the γ-ray data from all clouds reported by Neronov et al. (2012) is also shown (black curve). Right panel b) Differential γ-ray flux at 3 GeV versus (M5 is the cloud mass in units of 105 Mand dkpc is distance in units of kpc). The data points are numbered as in Table 2.

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