Fig. 11
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HCN(1−0)/CO(1−0) intensity ratio as a function of H2 column density for California, Perseus, and Orion A, color-coded as in Fig. 1. The solid and dashed black lines represent the two fits discussed in the text. The dashed red and blue lines represent, respectively, the fits derived by Gallagher et al. (2018) and Jiménez-Donaire et al. (2019) from extragalactic data.
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