Zonally and temporally, over five Earth years of simulation time, averaged meridional circulation streamfunctions for three HD 209458b- like models with rotation rates of 0.125Ω₀ (top), Ω₀ (middle), and 15Ω₀ (bottom). Here the meridional circulation profile is plotted on a log scale with clockwise circulations shown in red and anti-clockwise circulations shown in blue. At the base rotation rate, for example, these circulations combine at the equator to drive an equatorial downflow at almost all pressures.