Simplified sketch of the runaway greenhouse radius inflation effect. This illustrates how the transit radius of an Earth-like planet varies as a function of stellar irradiation, assuming two different water reservoirs (1 and 100 times the Earth oceanwater content). At the runaway greenhouse limit, a planet experiences a sharp transition from a temperate to a post-runaway greenhouse climate (or vice versa). This results in a sharp variation of the radius and density. While efficient atmospheric escape could erase the runaway greenhouse radius inflation effect for planets with a limited water reservoir (e.g., Venus), it should have a much less pronounced effect on water-rich planets (e.g., with 100 times the Earth ocean content), based on theoretical escape rate estimates (Bolmont et al. 2017).