Fig. 7
C18O (1–0), C17O (1–0), C18O (2–1), and C17O (2–1) spectra averaged over the low-brightness-temperature mask (details are discussed in Sect. 3.4). The two C17O spectra have been scaled by a factor of 4. The hyperfine structure components of both C17O transitions are indicated by vertical dashed lines.
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