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Fig. 6


CO(10) to CO(21) flux ratio (black) where each of the CO(10) and CO(21) fluxes has been averaged over five successive velocity bins and over the concentric rings defined in the text. The lower right panel indicates all pixels with R< 5′′. The result of the best fit of the model described in Sect. 4 is shown in red and that of its modification described in Sect. 5 is shown in blue. The horizontal lines indicate the level (0.063) above which the data must lie, under the hypothesis of local thermal equilibrium.

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