Equilibrium temperature–radius diagram (left panel) and mass–radius diagram (right panel) color-coded by entropy for the 314 hot Jupiters selected for our analysis. The solid black and the red dashed lines compare the radii computed using our model completo21 and TF18, respectively. Both models are for a 1 M_J planet with a pure H/He composition with Y = 0.27 at 5 Gyr and without accounting for inflation. The entropy was computed using the observed physical properties and an assumedheavy-element fraction of 0.2. Planets with large radii tend to have high internal entropy, with a weak dependence on planetary mass.