Normalized cumulative distribution function for the disk sizes for disks around smooth single stars (blue, from Long et al. 2019)and disks around the stars in multiple stellar systems (red for primary component, black for secondary). The red dashed line shows the distribution for the disks around primary stars in multiple systems including CIDA 9 A and UZ Tau E, who are known to have ring-like structures (Long et al. 2018), and the black dashed line shows the distribution including T Tau S, which is an unresolved binary (see Appendix A.1).