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Fig. 6
Observed spectra (black line) of the three 3 mm C3N doublets at the PDR peak. The green horizontal lines are the ± 3σ levels. The red spectrum is the LTE model for a 6′′ × 50′′ filament centered at the PDR positions, a 10 K excitation temperature, and a column density of 2 × 1012 cm-2.
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