Scatter plot of the CO isotopologue column densities as a function of the dust-traced H2 column density. Inaccurate estimations are filtered out. The black dashed lines show the expected gas phase abundances relative to H2 with no depletion: C18O/H2 = 5 × 10−7, 13CO/H2 = 4 × 10−6, and CO/H2 = 1.4 × 10−4.
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