Emergent spectra of two thin model atmospheres above a black-body condensed surface (solid curves) with T_eff = 1.2 × 10⁶ K and B = 4 × 10¹³ G together with fitting spectra (dashed curves). The fitting spectra are black-body spectra with the color temperature T_c = f_cT_eff and two Gaussian lines. Top panel: the spectrum of the model with surface density Σ = 10 g cm^-2. Parameters of the fitting spectrum: f_c = 1.2, D = 1.14^-4, center of the first line (proton cyclotron) E₁ = 0.25 keV, optical depth τ₁ = 2.6, and width σ₁ = 6 eV, and for the second line (H bound-bound transitions) E₂ = 0.3 keV, τ₂ = 1.1, σ₂ = 40 eV. Bottom panel: the spectrum of the model with surface density Σ = 1 g cm^-2. Parameters of the fitting spectrum: f_c = 1.12, D = 1.12^-4, line parameters are the same as above, except τ₂ = 0.08.