Departure coefficients for levels of C I (left panel), and for levels of O I (right panel), in different ⟨3D ⟩ model atmospheres assuming [C/Fe] = [O/Fe] = 0.0 and ξ_mic = 1.0 km s⁻¹. The levels of intermediate excitation indicated here are, for C I, 2p.3s ³P^o (7.49 eV), 2p.3s ¹P^o (7.68 eV), and 2p^{3 3}D^o (7.95 eV); and for O I, 2p³.3s ⁵S^o (9.15 eV) and 2p³.3s ³S^o (9.52 eV). The C I 2p^{3 5}S^o (4.18 eV) is indicated separately. The levels of high excitation indicated here are the ones above these levels. In both panels, the levels of low excitation potential remain close to unity throughout the atmospheres shown.