Left panel: evolutionary trajectory of a Type-P particle associated with the Set 1 of N-body simulations is represented by the black curve in an inclination i₂ versus ascending node longitude Ω₂ plane. The initial orbital elements of this particle are a₂ = 21.935 au, e₂ = 0.452, i₂ = 37.129°, ω₂ = 165.966°, and Ω₂ = 97.285°. The inner Jupiter-mass planet of such a system has a semimajor axis a₁ = 1.011 au and an eccentricity e₁ = 0.237. The red curve represents the separatrix of the system, while the blue curve illustrates the pairs (Ω₂, i₂) that vanish the ω₂ quadrupole precession rate for an inner perturber of e₁ = 0.237. Right panel: temporal evolution of the argument of pericenter ω₂ of the same particle.