Fig. 5.
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Observed HCN(4–3)/HCO+(4–3) ratios as a function of far-IR luminosity. In grey: resolved measurements in z ∼ 0 galaxies from Tan et al. (2018); black: galaxy-averaged z ∼ 0 measurements from Zhang et al. (2014); blue: high-z galaxies. The HCN/HCO+ ratio in SDP.81 is lower than in most extragalactic sources (for both low- and high-redshift ones).
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