Fig. 12
Column density ratio of HCN/HC15N at 1 Myr as a function of radius in the fiducial disk model for four variations of the chemical network: low-temperature exchange reactions on or off and self-shielding of N2 on or off. The dashed gray line marks the elemental 14N/15N ratio of 440. The dark and light gray shaded regions indicate the range of observed ratios and uncertainties from Guzmán et al. (2017), probing material out to 100 au.
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