Distributions of initial conditions (a₀, i₀) of surviving orbits after 1 Gyr evolution. The blue points are the 986 selected orbits without the Yarkovsky effect. The green points and red crosses indicate the survivors with Yarkovsky effect in retrograde and prograde rotation, respectively. From left to right panels, the absolute value of semi-major axis drift rates is 0.8, 1.2, and 1.6 AU/Gyr, respectively. Several points around i = 30° are ignored for a better vision.