DA-type white dwarf models (1.0 M_⊙). The thick solid line represents the GDE as a function of effective temperature. The continuous thin line indicates the ratio F_c(τ)/F_r(τ) for log g = 8.5 and the dashed one denotes the same but for log g = 8.0. All calculations were performed at τ = 100.0. We note that the T_eff range of the atmosphere models by Cukanovaite (in prep.) is limited to T_eff ≤ 60 000 K. The arrow indicates the direction of time evolution.