Color correction (top panel) and dilution (bottom panel) factors as functions of the corrected relative luminosity. They are computed using residual spectra of the heated helium model atmospheres for three accretion rates, ℓ_a = 0.05 (dark blue), 0.03 (red), and 0.01 (light blue). Other parameters are χ = 0.2, η = 0.75, and Ψ = 60°. The corresponding factors computed using spectra of undisturbed atmospheres are also shown by black curves.