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Fig. 5


Correlations between αHerschel − HCN and G0 (blue line and filled circles) and between αHerschel − HCO+ and G0 (red line and filled circles). The blue and red lines correspond to the best-fit relations: [M (K km s-1 pc2)-1] and [M (K km s-1 pc2)-1]. The horizontal line marks αGS04 − HCN = 10 [M (K km s-1 pc2)-1]. The uncertainties in αHerschel − HCN and αHerschel − HCO+ as estimated from the uncertainties are a factor of 2 (Roy et al. 2014). The uncertainties in G0 are also a factor of 2 (see Sect. 3.3).

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