Zonally and temporally averaged (over a period of ≈30 yr) stream function for two models with either a relatively “strong” (G – left – log (τ₂₂₀) = 15) or very weak (H – right – log (τ₂₂₀) = 20) isothermal relaxation (cooling) in the deep atmosphere (P > 10 bar). Clockwise circulations on the meridional plane are shown in red and anticlockwise circulations are shown in blue. Additionally, the zonally and temporally averaged zonal wind is plotted in black (solid = eastward, dashed = westward).