Synthetic JWST CMDs of NGC 6791 cooling sequence. Upper panel: synthetic CMDs for 8.5 Gyr WD populations (see the main text for details) at the distance of NGC 6791, calculated from isochrones with neon distillation and either the c07 (black filled circles) or the b20 opacities (red open squares). Lower panel: same as the upper panel, but for calculations without the inclusion of neon distillation.