Distribution of physical properties of galaxies drawn from the PROSPECTOR-β model. The redshifts and stellar masses are jointly drawn from the sum of two Schechter functions (Leja et al. 2020), the star formation rates (averaged over the last 100 Myr) are computed from the non-parametric star formation histories, while the stellar metallicities are drawn from a clipped Gaussian approximating the stellar mass-stellar metallicity relationship of Gallazzi et al. (2005).