Fig. 8
Variation of the HCN/HCO+ ratio with metallicity. References are Brouillet et al. (2005), Chin et al. (1997, 1998) for M 31 and the Magellanic Clouds, Buchbender et al. (2013) and the present work for M 33, and this work for IC 10 and NGC 6822. Typical uncertainties for individual points are 0.2 dex for the metallicity and 0.3 in the HCN/HCO+ ratio.
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