Ratio between HCN(5-4) and [CI](1-0), tracing the dense-gas fraction, as a function of the ratio between the infrared and the [CI](1-0) luminosity, tracing the star formation efficiency. The data comes from the same references as in Fig. 6. The red solid line is a linear relation between the dense-gas fraction and the star formation efficiency (DGF ∝ SFE), which normalization has been set to match the mean value of our sample (red star).
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