Mass-radius diagram for all known transiting planets with masses between 0.5–3 M_⊕ and radii 0.5–2 R_⊕ determined with a precision better than 30%. GJ 357 b is shown in red. Planets orbiting around late-type stars (T_eff < 4000 K) are shown in orange, otherwise gray. The size of the orange datapoints is inversely proportional to the magnitude of their host star in the J-band. Data are taken from the TEPCat database of well-characterized planets (Southworth 2011). Theoretical models for the planet’s internal composition are taken from Zeng et al. (2016).