a)Mdense,HCN against , and b)Mdense,HCO+ against . Red lines correspond to best-fit linear relations to the red data points: and . The red filled circles use Mdense,mol values derived from the relation . In panel a, the black open squares use Mdense,HCN values derived from the “extragalactic” relation Mdense,HCN = αGS04 − HCN × LHCN, where αGS04 − HCN = 10 M⊙ (K km s-1 pc2)-1; the black line corresponds to the best-fit linear relation to the open squares: Mdense,HCN (≡αGS04 − HCN.
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