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Fig. B.1

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2D histograms showing the line intensity ratios HCN/CO, HCN/HNC, HCN/HCO+ J = 1–0, and [C I] 492 GHz/CO J = 1–0 with respect to the visual extinction AV. The dashed red line marks the running median. The error bars mark the standard deviation. The dashed black line marks the intensity ratio equal to one.
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