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Fig. 13
[C ii] spectra towards the Horsehead PDR and PDR1+2, averaged over 180 (left) and 3140 (right) pixels. Arrows indicate the positions of the [12C ii] line and the [13C ii] F = 2 − 1 and F = 1 − 1 lines (from left to right); the [13C ii] F = 1 − 0 line falls outside the spectral range of our map.
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