Top: normalized dust mass ( M _d / M _*) for the warm (asterisks) and cold (triangles) components plotted as a function of dust distance ( D) for systems that are well fit using two blackbodies. Overplotted is a line showing M _d / M _* ∝ D ² for comparison. Bottom: same as above using the Gáspár et al. (2013) model to estimate the dust mass at an age of ~10 Myr. Overplotted is a line showing the minimum solar-mass nebula ( M _d / M _* ∝ D ^3/2) for comparison.