Fig. 3
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Simulated deuterium fraction ratios of H2CO and H2CS as functions of time in the single point model (0D). The top row displays gas-phase abundance ratios, while the grain-surface ratios are displayed on the bottom row. From left to right, the columns correspond to a volume density of n(H2) = 104 cm−3, n(H2) = 105 cm−3, or n(H2) = 106 cm−3, respectively. The asterisks denote grain-surface molecules.
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