Spectral index, size–luminosity, and initial parameter distributions for the entire parameter space of initial conditions. We compare our simulated spectral index distributions to the observed sample of Lupus region reported in Tazzari et al. (2021b). The latter is a collection of disks from the Lupus region, detected at 0.89mm (Ansdell et al. 2016) and 3.1mm (Tazzari et al. 2021b). We compare our simulated SLR to the observed sample reported in Andrews et al. (2018b).