Fig. 10
Fractional abundance of 12CO (black) and C2H (red) relative to H2: model including the density enhancements (full lines), and models without density enhancements, assuming the average interstellar UV field of Draine (1978) scaled by a factor 1 (dotted lines), 0.5 (dashed lines), and 0.25 (dash-dotted lines). See Sect. 4.3.2 for a discussion of this plot.
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