Ratio between the sub-mm ring R_mm and radius ofthe CO wall R_CO. For this particular plot, the ¹³CO J = 3-2 line is used. As in Fig. 11, circles, squares, and diamonds indicate quantities retrieved from images convolved with a 0.03^′′, 0.08^′′, and 0.15^′′ beam, respectively, for sources located at a distance of 150 pc. The dashed green line shows a linear fit obtained for this relation in log–log space. The gray dashed line indicates the fit by de Juan Ovelar et al. (2013) for the sub-mm radius/scattered light wall, obtained from a subsample of the same hydrodynamical simulations used in this paper.