Fig. 14
Fraction by mass of CO-dark H2 gas for different classes of clouds: (upper left) diffuse molecular clouds, the [C ii] sources with no CO; (upper right) transition molecular clouds, [C ii] sources with only 12CO; (lower left) dense molecular clouds, with 13CO and no C18O; and, (lower right) dense molecular clouds with 13CO and a dense C18O core (or cores).
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