Fig. 2.
SFR plotted against CO luminosity 
. The regression shown by a long-dashed line indicates an imposed unit slope and a best-fit offset of −8.51 ± 0.02, roughly consistent with the correlation found by Gao & Solomon (2004) as described in the text. Galaxies are color-coded by 12 + log(O/H) as indicated in the color wedge in the far-right panel.
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