Phase-space distribution of particles that comprise the initial state of the system. The disc (red solid circles), fallback (blue open circles), tidal tail (green filled circles), and unbound debris (black triangles) components are separated according to the sign of their total specific energy e_tot, and the ratio of the kinetic energy in the ϕ direction e_kϕ to the internal energy e_int, as indicated in panel (b). The vertical line in panel (c) indicates the radius r_cut at which the disc wind properties are measured from 2D simulations. This radius marks the inner radial boundary of 3D models.