White dwarf luminosity functions when only hydrogen-rich synthetic white dwarfs are generated in the Monte Carlo simulation. The bottom panel shows, with solid squares, the residuals between our standard model, in which a fraction of 20% of non-DA white dwarfs was employed, and, with hollow circles, that in which this percentage is zero, Δ = 2(N_std − N_{no − DA}) / (N_std + N_{no − DA}), respectively.