Summary of physical condition constraints from the RADEX models on the emitting regions of the CO rovibrational lines. Figure 14 shows a version of this figure updated with the results of the full disk modeling. The constraints derived here are used to guide the DALI modeling. Regions are not shown to scale. The right panel shows solution #1 from Fig. 6 as observations of ¹³CO ro-vibrational lines indicate the presence of large columns of CO (van der Plas et al. 2015).