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Fig. 7

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CR ionization rates at different distances from the center of the hypothetical GMCs. The diffusion coefficient of the CRs is D0 = 4 × 1028 cm2/s (solid lines) or D0 = 4 × 1026 cm2/s (dashed lines), and the mass of the molecular cloud is 1 × 106 M (black lines) or 1 × 105 M (gray lines).

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