Velocity and angular dependent cross-sections. Following Fig. 1, the enclosed mass within 10 pc (upper panel) and the energy conservation (lower panel) are shown. In detail, a velocity-independent isotropic cross-section (blue), a velocity-independent forward-dominated cross-section (light blue), a velocity-dependent isotropic cross-section (red), and a velocity-dependent forward-dominated cross-section (light red) are displayed. They all have the same resolution of N = 10⁷ and a gravitational softening length of ϵ = 1 pc. More details on the simulations O, P, R, and S can be found in Table A.1.