Fig. 3.
Ratio of CO luminosity 
and SFR plotted against specific SFR (left panel), 12 + log(O/H) (middle), and GALEX FUV−NUV color (right). In the left panel, the long-dashed line corresponds to the robust fit given by Eq. (4) and the (gray) line to the shallower slope (−0.38) from Hunt et al. (2015). The gray shadowed region in the leftmost panel indicates the range of uncertainty on the slope in Eq. (4). Galaxies are color-coded by 12 + log(O/H) as in Fig. 2.
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