Comparison of cloud formation models for T_eff = 1800 K, log g =3, metallicity Z = 1, and β = β′ = 1. The previous DRIFT model is shown by the thick grey lines. Two DIFFUDRIFT models are overplotted assuming pure gas diffusion (dashed lines) and gas + particle diffusion (black solid lines). dust/gas = ρ_dL₃ is the dust-to-gas mass ratio, n_d = ρL₀ the number density of cloud particles, the mass-mean particle radius, and the corresponding drift velocity according to Eq. (6).