Fig. 8

ΣSFR as a function of the CO-dark H2, CO-traced H2, and total molecular gas surface densities, as determined by Pineda et al. (2013). The straight lines are linear fits to the data. We also include the relationship between the SFR and molecular gas surface densities determined for external galaxies by Bigiel et al. (2008). All gas surface densities have been corrected to account for the contribution of He.
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