Temporal evolution of a six-planet simulation showing a merger between the first three and the fourth and fifth planets, leaving behind a three-planet system with similar masses to the observations. The upper panel displays the semimajor axis a_i, the variation of the apocenter Q (defined as a_i[1 + e_i]), and the pericenter (q = a_i[1 - e_i]). In the bottom panel we show the variation of the eccentricities.