Time evolution of cumulative number of coalescences n_coal (top two rows) and collisions n_coll (bottom two rows) for the eight runs. Columns give increasing ω₀ from left to right. K models (GR kicks on) use a white background; NOK models are shaded light grey. The horizontal axis is logarithmic in time (Myr) to clarify the pre-core-collapse phase. Colours indicate outcomes: MS (blue), CHeB (purple), ShHeB (orange), BH (black); collisions BH-BH (black) and MS-MS (cyan). Counts are in Table B.2