Abundances of the ammonia isotopologs summed over the spin states (left), corresponding D/H ratios (middle), and spin-state ratios (right), as functions of time in the H-MM1 core model. Solid lines represent the FS model, while dashed lines represent the PH model. Observational ratios derived by H17 are overlaid (hatched boxes). The orange hatched box in the middle panel represents the NH2 D∕NH3 ratio calculated using an NH3 o/p ratio of 0.5 (see text for details).
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