Evolution of normalised rotation period P_rot∕P_⋆ as function of time (yr) in logarithmic scale. This is given in the case of an Earth-sized planet orbiting the TRAPPIST-1 star with a six-day orbital period. The Rayleigh drag frequency of the ocean is set to σ_R = 10⁻⁵ s⁻¹ for cases of strong drag (top panels), and to σ_R = 10⁻⁶ s⁻¹ for cases of weak drag (bottom panels). The planet eccentricity takes the values e = 0.063, 0.2, and 0.3 from left to right. In each panel, a set of planets with various ocean depths is studied. These configurations are parametrised by , where the ocean depth is given in kilometers. The parameter γ is sampled from −2 (the driest case of the sample, solid orange line) to 0 (the most humid case, solid blue line). Values used for the planet parameters are given by Table 1.