Evolution of semimajor axis, orbital eccentricity, and resonant angles during a migration process and postdisk phase. Libration of resonant angles ﹩3{\lambda }_{i+1}-2{\lambda }_{i}-{\widetilde{\omega }}_{i}﹩ or ﹩3{\lambda }_{i+1}-2{\lambda }_{i}-{\widetilde{\omega }}_{i+1}﹩ indicates the 3:2 mean motion resonance between planet i and planet i + 1. λ _i = M _i + Ω _i + ω _i , and ﹩{\widetilde{\omega }}_{i}={{\rm{\Omega }}}_{i}+{\omega }_{i}﹩.