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Fig. 2
Deep [C ii] and CO J = 13 → 12 spectra toward BD+40°4124 and V 1318 Cyg. [C ii] is plotted in black and the CO line profiles in red. For BD+40°4124, where the CO J = 13 → 12 line is quite faint, we multiplied the spectrum with a factor of four. The systemic velocity is marked by a vertical gray line.
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