Surface density profile evolution for Γ₀ (top-left), Γ₂ (top-right), Γ₄ (bottom-left), and Γ₈ (bottom-right). The planet’s position at 10 au is marked by a dashed red line. The planet opens a primary gap and excites three overdensities (D₁, D₂, D₃). Surface density profiles are obtained by integrating the volumetric density over the polar angle (θ) and then averaging over the azimuthal angle (ϕ) for each orbit.