Figure 2: Schematic diagram of the energy fluxes present in the first internal convective cell. 𝑇 1 at 0.714 𝑅 𝑠 is taken as the temperature of the first isothermal layer, 𝑇 e x t = 3 K is taken as the cold reservoir temperature, and 𝑇 2 is taken as the upper shell temperature of the first convective cell. Short arrows indicate that emitted radiation is rapidly absorbed by opaque gases.