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Fig. 12


Theoretical fractional abundances ratios for the grid of UCL_CHEM models at low AV (2 mag; left panel) and at high AV (10 mag; right panel). The black squares are CO/HCO+ ratios; red stars = CO/HCN; green crosses = CO/CS; cyan triangles = HCN/CS; blue triangles = HCN/HCO+.

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