Abundance corrections obtained for selected elements and for the CO molecule with the model atmospheres computed using different treatments of scattering (plotted versus the excitation potential χ, for lines at λ = 400 nm). For each element, two cases are shown: (a) with scattering treated as true absorption (solid lines), and (b) with scattering opacity neglected in the optically thin regions (dashed lines). Atmospheric parameters of the model atmospheres are T_eff = 5020, log g = 2.5, and [M/H]  = −3.0. Three types of abundance corrections are shown: Δ_{3D−⟨ 3D ⟩} (left column), Δ_{⟨ 3D ⟩ −1D} (middle column), and Δ_3D−1D (right column).