Evolution of eccentricity (e) and semi-major axis (a) as a function of accreted mass. For each panel, the systems start from a different initial mass ratio (q₀) that spans from 0.1 (top left) to 1.0 (bottom right). Within each panel, the initial eccentricity (e₀) spans from 0.01 to 0.8. The trajectories are colored based on the mass change ΔM/M₀, where M₀ is the initial mass of the binary and ΔM is the amount of accreted mass. All the systems start along the vertical line a = a₀, highlighted with a thick gray line.