Comparison of the temperature stratification for the four T_eff = 4476 K, log g = 1.2 giant models (upper panel). The solid line denotes the reference mixture, the dashed line the CNONa mixture with Y = 0.246, the dot-dashed line the CNONa1 mixture with Y = 0.4, and the dash-dot-dot line the CNONa2 mixture. In the lower panel the percentage temperature difference for the last three mixtures with respect to the reference one is plotted; colour and line type are coded as in the upper panel.