Ratio between HCN(4-3) and CO(4-3), tracing the dense-gas fraction, as a function of the ratio between the infrared and the CO(4-3) luminosity, tracing the star formation efficiency. 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.
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