Distribution of particles moved by a jet before any hydrodynamical time step has occurred. Shown is the parallel distribution marginalised over the plane of the jet (blue) and the radial distribution marginalised over the direction of the jet (orange) vs. the expected theoretical distributions from Eqs. (16) and (18) (dashed grey). The abscissa is in units of r_AGN in the parallel direction and in units of r_AGN/2 in the radial direction. The distribution of gas tracers sent into the jet perfectly matches the expected one.