Fig. 8
Ratio between J = 2–1 and J = 1–0 integrated intensities as a function of H2 column density for the three CO isotopologs for which both transitions were observed (red circles). The blue dashed line represents the prediction from a radiative transfer model of an isothermal cloud at 11 K. The dotted lines represent similar models for 15 K (higher curve) and 7.5 K (lower curve).
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