Spectra of CO isotopologues in the north clump (black) and in the main filament (red). Spectra are averaged within 2 arcmin-wide square regions centred at (α, δ) = (6:40:54.9;+10:55:40.8) for the north clump and (α, δ) = (6:41:03.6;+10:34:28.7) for the main filament. In the C17O (J = 1–0) transition, the three vertical blue lines indicate the positions of the three hyperfine components assuming vlsr = 5.3 km s−1.
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