Evolution of an outer particle that results from the No-GR (red curve) and GR (blue curve) simulations. The semimajor axis and eccentricity of the inner planet are a₁ = 0.95 au and e₁ = 0.73, and the orbit GR precession timescale is t_GR = 39 Myr. The horizontal dashed black line represents a value of the inclination i₂ of 90°. Left panel: evolution in time (normalized to t_GR) of the particle’s inclination i₂. Right panel: evolution of the particle in the inclination i₂ vs. ascending node longitude Ω₂ plane. The initial conditions of the particle are a₂ = 35.75 au, e₂ = 0.85, i₂ = 152.48°, ω₂ = 202.18°, and Ω₂ = 41.03°.