Similar to Figure 1, but including mutual gravitational interaction between two CBPs. The initial longitude of pericenter of each planet is randomly chosen between 0 and 2π. The evolution of the system can lead to either collision or ejection. Left panel: two planets with initial semimajor axes a_p = 2.13 au and 1.24 au collide into a single body. Right panel: one planet initially located at a_p = 2.13 au is ejected from the system.