Temperature T (top), number density ρ (middle), and ionisation level ξ (bottom) structures in the disk midplane, as functions of radius. Temperature and density structures are calculated from the prescription for the Minimum Mass Solar Nebula structure in Hayashi (1981); Aikawa & Herbst (1999). The ionisation structure is calculated assuming a cosmic ray ionisation rate of ξ = 10⁻¹⁷ s⁻¹, and accounting for surface density-dependent attenuation of this rate at each radius in the disk midplane, following the prescription from Umebayashi & Nakano (2009).