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Fig. 15

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Reduced χ2 plots for the drop and jump abundance profile for the C18O lines in IRAS 4A and 4B, respectively. The freeze-out abundance XD and inner abundance Xin were varied. All lines were taken into account except J = 1–0 and 5–4 owing to the comparatively larger beam sizes. The contours are plotted at 1σ, 2σ, 3σ, and 4σ confidence levels and white crosses show the best-fit values.

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