Fig. A.3
CO isotopologues line intensities normalized by the intensity for gas-to-dust =100 as a function of gas-to-dust ratio. Keeping the gas mass fixed, two T Tauri disk models (Rc = 60 au, γ = 1, ψ = 0.2, hc = 0.2, Mdisk = 10-4, 10-2 M⊙) have been run with gas-to-dust mass ratios of 100, 10 and 1. Orange, blue and red circles show respectively 12CO, 13CO, and C18O lines.
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