Fig. 14
Observed C17O 3–2 and C18O 6–5 line profiles (black) overplotted with the modeled line profiles resulting in RATRAN after applying a) ~1.5 orders of magnitude drop in CO abundance at the snowline (blue) or b) CO constant abundance of 3 × 10-5 (red) and the best-fit abundance profile as derived from our chemical models for UV = 10 × ISRF at AV = 1 mag (black line in Fig. C.4).
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