Fig. A.1
Hydrocarbon lines detected toward the Horsehead PDR at RA = 5h40m53.936s, Dec = −2°28′00′′ (J2000). Only lines in the 3 mm band, whose energy of the upper level is lower than 100 K and which have a higher signal-to-noise ratio than 8, are shown. The green lines are Gaussian fits. The vertical dashed lines mark 10.7 km s-1.
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