Initial distributions of the semi-major axis, eccentricity and mass ratio of the binary populations used in this work. Two mass groups are distinguished according to the primary component mass: m₁ <  5 M_⊙ (grey) or m₁ ≥ 5 M_⊙ (black). Models with (solid line) and without (dashed line) eigenevolution are compared. Models with and without primordial mass segregation (ten realisations each) are combined in each curve.