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Fig. 14

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Reduced χ2 plots for the anti-jump abundance profile in IRAS 4A for the C18O lines in which the freeze-out abundance XD and depletion density nde are varied. The left panel take the low-J lines C18O 1–0, 2–1, 3–2 into account, whereas the right panels use the high-J C18O 5–4, 6–5, 9–8, and 10–9 lines. The contours are plotted for the 1σ, 2σ, 3σ, 4σ, and 5σ confidence levels.

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