Our simulation, but for 10³ point masses instead of 10⁴, and for varying kick distributions. Similarly to the results shown in Fig. 2, we evaluate the points below 20 Myr every 1 Myr (light blue curve) and after 20 Myr every 10 Myr, which provides the velocity distributions shown in normalised histograms with a bin width of 30 km/s. For the kick distributions, we use Maxwellians (Eq. B.1) with a σ varying from 100 km/s to 500 km/s, with intervals of 50 km/s.