Temperature (left), potential temperature (middle), and vapor mixing ratio (right) profiles for the four giant planets (top to bottom; see label). For each planet, several internal water contents are shown (see legend on each line), corresponding to black stars in Fig. 5. Usual two-layer models following a simple moist adiabat are drawn in blue, and three-layer models with convection inhibition are shown in red (but only for models with q_int>q_cri ~ 0.07 that actually possess an inhibition layer). The potential temperature accounts for variations in μ and c_p in the adiabatic index (see Eq. (9)), so that dry adiabats appear as vertical lines in the middle panel.