Cumulative distribution functions of the distance metric used in family finding computed using the uncertainties reported by the asteroid catalogs. Proper elements for the purpose of family finding are considered trustworthy if the uncertainties correspond to relative velocities below 10 m s⁻¹. SBDynT’s uncertainties have a nearly identical distribution to the D. Nesvorný et al. (2024) catalog, with nearly 60% of the objects we consider falling below this threshold, and outperforming the Asteroid Families Portal, though the difference is considered minor. Compare to Figure 2 in D. Nesvorný et al. (2024). See also Appendix C for a related figure.