Average evolution of Neptune’s semimajor axis with Neptune’s initial semimajor axis coming from the static integrations and experiencing migration with the same migration rates as those suffered by Neptune for the last 3 Gy of the great integration shown in Fig. 2. Also plotted is the result of the application of Neptune’s migration on particles started at hibernating mode: “R” stands for a particle that remained in resonance to the end of the integration and “E” for a particle that eventually escaped the resonance before the end of the integration. The time associated with either of these symbols stands for the initial time of integration with Neptune experiencing the semimajor axis evolution shown in this plot. All integrations are extended to 4.5 Gy.