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Fig. 5


Fractional abundances, relative to H2, of N2 and N (top panel) and C+, C, and CO (bottom panel) as a function of radius. Solid lines: from the SS model (Li et al. 2014), full shielding (dust + self- + H2 + H) are considered using an updated N2 photodissociation rate and self-shielding function (Li et al. 2013). Dashed lines: calculated from a model similar to that of McElroy et al. (2013), but adopting assumptions specifically for IK Tau. In this model only dust shielding is considered when calculating N2 photodissociation, and CO self-shielding is treated only approximately.

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