CO(1−0) to CO(2−1) flux ratio (black) where each of the CO(1−0) and CO(2−1) 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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