Circulation regime bistability in the simulations with the rotation period set to 6.1 days. The circulation regime switches to another state when the convection scheme is switched off—compare the two leftmost columns (the StretchExplicit and StretchReduced cases). Top panels show instantaneous top-of-atmosphere outgoing shortwave radiation. Bottom panels show the time mean surface temperature in Kelvin overlaid by streamlines of the horizontal wind at ≈8 km above the surface.