Model predictions for the chirp mass M_chirp, effective inspiral spin parameter χ_eff, cosmological redshift of merger z_merger, BBH merger timescale T_merger, metallicity Z and the binary mass ratio q distributions of binary black holes observables at design sensitivity, in blue, vs. the underlying population of merging BBHs one would observe with a GW detector with infinite sensitivity, in gray. Lighter shades represent larger contour levels of 68, 95 and 99%, respectively.