Fig. 5
CO number density and the 12CO J = 2−1 emitting layer (hatched area) for the four fiducial models. The upper and lower bound of the emitting layer at each radius correspond to 15 and 85 percent of the total flux, integrated from top to bottom. The white solid contour shows Tdust = 25 K. To determine the emission layer we assume that we are looking face-on onto the disk.
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