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Fig. 12

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Ice column density ratios of seven species with respect to H2O in three protostars (IRAS 23385, IRAS 2A, and B1-c; Rocha et al. 2024, this work) and one comet (67P/C-G; Rubin et al. 2019). The ice column densities of CH3OH for IRAS 23385 and CH3OCHO for 67P/C-G are not reported in the references.

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