Fig. 10
Abundance ratios n(CH)/n(H2) (top), n(CN)/n(CO) (middle), and n(CS)/n(C) (bottom) in the vicinity of the total gas density peak, located at (X ≃ −4.7 pc,Y ≃ −24 pc). Contours mark total gas densities nH of 100, 200, 300, 400, 500, 1000, and 2000 cm-3.
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