As Fig. 3 for model a4-h.07-.25s. In this model, migration of the Neptune is stalled at around t ≃ 8000. In this state featuring a more eccentric disk, the torque variation on the sidereal period clearly dominates over that on the synodic period. The torque offset Γoff is close to zero. We note that at the times of a torque maximum (e.g. III), the outer spiral arm is not trailing the planet but excited at a location leading its orbit, which might lead to the positive torque.
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