Different outgoing longwave radiation (OLR) models as a function of temperature. The dotted black line represents the radiation emitted by a blackbody. The solid lines represent the theoretical values for each OLR model while the dotted colored lines represent values outside of the surface temperature boundaries for each model. Left: the OLR for pCO₂ = 280 ppm. Right: the OLR for pCO₂ = 5 bar.