Photochemical model of the Horsehead PDR. AV increases from right to left; the PDR edge, delineated by the red vertical line in Fig. 2, corresponds to AV = 0. a) Horsehead density profile nH = n(H) + 2n(H2). b) Predicted abundance of CF+ in red, HF in blue and C+ in green. The red horizontal bars show the measured CF+ abundances, and their length represents the beam size. c) Predicted intensity profiles.
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