Disk size comparison of the models and the observations. Top panel: gas disk size (R_CO), defined as the radius enclosing 90% of the ¹²CO J = 2− 1 flux. Observed R_CO, including uncertainties, are shown as a colored error bar (Ansdell et al. 2018). Gray vertical lines denote the range of R_{CO, mdl} measured after noise is included (see Appendix D). The upper and lower points of the gray line show the 84th and 16th quantiles, respectively, of the noisy R_CO distribution (cf. Appendix E). Bottom panel: as above, but showing the dust disk size, defined as the radius that encloses 90% of the 1.3 mm continuum flux. The blue dashed line shows the best fit of the offset between R_{mm, mdl} and R_{mm, obs} (see Sect. 4.2).