Same as Fig. 6 but the left plot is for the planet with m_p = 100 m_⊕ and initial orbits r_p = 2AU and 3 AU in the system with initial M₁ = 7.0 M_⊙ and a = 30 AU. The center plot is for the planet with m_p = 2000 m_⊕ and initial orbits r_p = 3 AU and 4 AU in the system with initial M₁ = 5.0 M_⊙ and a = 30 AU. Additionally, the dashed curve shows the migration track determined by the rate of decretion. The dotted and the dot-dashed curves show, respectively, the timescale of decretion and the location of the largest dynamically stable planetary orbit. The right plot is as the center plot but for M₁ = 1.7 M_⊙ and for planets with initial orbits r_p = 4 AU and 5 AU.