Fig. 2
Radial intensity profiles of the 12CO 2–1 line emission, normalised to the peak intensity, for models with Rc = 50 AU. Crosses above the line denote the dust outer radii, defined as the radii enclosing 90% of the total flux. Vertical dashed lines denote the radius at which the CO column density drops below 1015 cm −2, where it canbe photodissociated effectively.
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