Orbital evolution of two disk particles under the effects of gravitational perturbations and collisional drag (η = 10⁻³). The central body was defined by μ = 0.05, R₀ = 115 km and Ω₀/n₁ = 0.46. Top: Eccentricity versus semimajor axis. Initial conditions are indicated in filled circles, while arrows show the direction of flow. The equilibrium eccentricity e_eq, is highlighted in orange. Bottom: Semimajor axes as a function of time. Notice that the semimajor axes of the particles converge over time.