DALI disk structure of the two representative models, ψ = 0.05 (left panels) and ψ = 0.25 (right panels). Top: gas density structure: the inset shows the inner disk structure, the dark blue curves indicate the n_gas = 10⁶,10⁸, and 10¹⁰ cm^-3 contours. The line contribution functions of a mix of low- and high-J transitions of ¹²CO (solid lines) and ¹³CO (dashed) are overlaid on the n_gas panels. Each contour shows the layer where 50% of the line flux emerges. Middle: gas temperature structure, the isothermal contours are overlaid for T_gas and T_dust (dashed lines) = 20, 50, 100, 200, and 500 K. Bottom: gas temperature radial profile at different disk heights relevant to the disk midplane (z/r = 0.01) and to the CO emitting layers.