Diagram V_mig vs. averaged semimajor axis for particles that were initially in 2:5 MMR with Neptune. The average is calculated over the past 5% of each simulation. The black filled circles represent particles that started the new simulations in the hibernating mode, while the open circles represent those that started in the Kozai mode. The vertical lines are the approximate resonant semimajor axis before (at left) and after (at right) the residual migration of Neptune. It is clear that particles initially in the hibernating mode tend to escape the MMR, becoming fossilized objects, while the ones started in the Kozai mode, in the opposite way, tend to stay trapped in the MMR and follow the migration.