Initial distribution, masses, and radii of 12 000 bodies for a simulation with an initial solid disk mass of 10 M_⊕. The x-axis represents the distance from the central star in AU, and the y-axis the radii (left panel) and masses (right panel). Red, blue, and black indicate different mass ranges of the objects, i.e., mass M < 10⁻³ M_⊕ (considered as planetesimals), 10⁻³M_⊕ < M < 10⁻² M_⊕ (proto-embryos), and M > 10⁻² M_⊕ (embryos), respectively. There is no difference in the treatment of these objects during the N-body simulations. The isolation mass, which is the mass of embryos that accreted all the bodies within their feeding zone, is represented by the dashed line.