Fig. A.1
Abundance of 13CO in one quadrant the disk for two representative models. Panel a: self-similar disk model (Rc = 200 au, Mdisk = 10−3 M⊙, and γ = 1); panel b: simple power-law disk model (Rout = 200 au, Mdisk = 10−4 M⊙, and γ = 1). The white contours indicates the Tdust = 20 K surface below which CO freeze-out becomes important.
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