Disc-integrated mean values of the s_surf/s_blow ratio for all possible target-projectile pairs of sizes s_i and s_j. Upper left panel: A-star primary and ⟨e⟩ = 0.075. Upper right: A-star primary and ⟨e⟩ = 0.01. Bottom left: solar-type primary and ⟨e⟩ = 0.075. Bottom right: solar-type primary and ⟨e⟩ = 0.01. The dashed white line delineates the s_i = s_j diagonal of equal-sized impactors.