CO size ratio compared to the residuals from the elliptical Gaussian modeling for the six disks with two datasets available. The fiducial radii are the sizes obtained from the interferometric modeling of the visibilities from the DSHARP dataset, following the methodology described in Appendix A. Left panel: size ratio as a function of residuals over background fraction (criterion 1). Right panel: size ratio vs. the difference between residuals and background over the observed disk emission (criterion 2). The central redline represents the median value of the entire Lupus sample, left and right vertical lines are the μ ± σ values.