Continuation of Fig. 2 showing the dust temperature structure (top) and the CO-concentration (second row) calculated by PRODIMO based on the WI-3a model. Additional contour times show the ionization parameter χ/n (UV field strength divided by total particle density) to indicate where about the CO molecules photo-dissociate, and a dust temperature of 25 K to indicate where CO freezes out. The lower diagrams show the simulated 1.3 continuum and CO 2–1 line maps, from which we derive a continuum radius of 89 au and 109 au at 1.3 mm after 0.2 Myr and one Myr, respectively, and a disk radius in the CO 2–1 line of 198 au and 375 au, respectively. Each radius encircles 90% of the respective continuum or line flux.