Slices of spherical radial velocity v_r, sph. in the x − z plane in (a)-(f) and in the x − y plane in (g)-(j) for the BH (NS) companion in the left (right) column. The iso-surfaces in (a) and (b) enclose the bound mass according to the kin. energy criterion (Eq. (1)) in dashed gray. The gray streamlines in (c)-(j) represent the velocity field in the corresponding plane. The primary core (companion) is marked with a black cross (plus sign).