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Fig. 5
Relative abundances of HCO+, HCO and the ionization fraction as functions of AV. The boxes represent observations with error bars, and the lines are the model results for ζ = 10-17 s-1 (green dashed), ζ = 10-15 s-1 (pink dotted), and, from Fig. 2, the mid-range ζ(NH) ( blue dotted) and high-range ζ(NH) (red solid).
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