Semidiurnal tidal torque about the spin axis of a rocky planet with a global, uniform-depth ocean in the coplanar-circular configuration for various truncation degrees of the tidal solution ranging between N = 2 and N = 60. The torque is computed using Eq. (60). It is plotted as a function of the normalised tidal frequency, ω = (Ω − n_s) /Ω_E, with Ω_E = 7.2921 × 10⁻⁵ rad s⁻¹ being Earth’s actual angular velocity (Fienga et al. 2021).