Fig. 10.
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SFR/HCN luminosity ratio as a proxy for the star formation efficiency of dense molecular gas as a function of Σmol. Points are color-coded according to their environments. Vertical dashed lines show the surface density thresholds of ∼10 M⊙ pc−2 and ∼200 M⊙ pc−2, previously defined in Bigiel et al. (2008). The horizontal shaded region shows a range of 400 − 500 L⊙/M⊙.
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