Total and core radius as a function of mass for all planets with M > 2   M_⊕ at 5 Gyr. The total radius is shown by blue diagonal crosses, while the core radius is shown by red open squares. The dashed line is the M − R relation for solid planets with an icy composition (approximative solar composition beyond the iceline with 75% ice, 17% silicates and 8% iron). The solid line is for solid planets with an Earth-like rocky composition (2:1 silicate-to-iron ratio). These two lines show the radius if no external pressure is acting.