Tidal evolution of the orbital separation (top) and eccentricity (bottom) of WASP-117 b, calculated both forwards and backwards in time. Left: was set to a constant value of , while values of 10⁵ (solid line), 10^5.5 (dotted line), 10⁶ (dashed line), and 10⁷ (dash-dotted line) were used. The subplots show a zoom to visualize the variations. Right: was set to a constant value of , while values of 10⁵ (solid line), 10^5.5 (dotted line), 10⁶ (dashed line), and 10⁷ (dash-dotted line) were used.