Evolution of planetary embryos leading to the formation of Uranus and Neptune “analogs” in six different simulations. Six panels are shown and labeled from a) to f). Each panel refers to a different simulation and is composed of two sticking plots. The upper panel shows the time evolution of the semimajor axis of all migrating planetary embryos (gray) and giant planets (black). The lower panel shows the time evolution of the mass of those planetary embryos or cores surviving until the end of our integrations.