Differential rotation when the spin-down forcing C_sd is strengthened while the buoyancy is influential. From left to right and top to bottom C_sd = 0, − 10^-6, − 10^-5, − 10^-4, − 10^-3, − 10^-2 We use E = 10^-7, Pr = 3 × 10^-2, and β ≫ 1. Top row: the flow is dominated by the baroclinic forcing. Bottom row: the flow is dominated by the spin-down forcing. Numerical resolution is the same as in Fig. 5.