Left: the effect of a stratospheric absorber on the T − P profile of the day-side atmosphere. The curves are labeled with the values of the extra opacity, κ = 0.,0.02,0.05 cm²g^-1, and the core entropy, respectively. Notice that the entropy on the day side decreases with increasing the extra opacity. There is no stratosphere on the night side, so only one model is plotted. Right: the effect of the extra opacity in the upper atmosphere of the day side on the day-night side cooling. The models are calculated for three different values of the extra opacity, κ = 0.,0.02,0.05 cm² g^-1. Cooling from the day side increases with the value of the extra opacity. Cooling from the night side core is the same since only the day side exhibits a stratosphere. The difference between the night and the day side cooling is largest for lower values of the extra opacity, and the total core heat loss increases with increasing extra opacity.