Ratio between the hydrodynamic (L_hy) and energy-limited (L_en) escape rates as a function of Λ for the modelled planets orbiting the G2 (top), K2 (middle), and M2 (bottom) star. Within each panel, the legend indicates the mass (in M_⊕) and temperature (in K) of the modelled planets. The dashed line indicates the equality between L_hy and L_en, while the dotted line indicates where the L_hy/L_en ratio is equal to 2.0. The value of Λ_T lies between 15 and 35.