Stationary results for the jet simulations. The panels show the 2D distribution of the rest-mass density for different ambient medium configurations as indicated by the exponent m and d_k (d_k = 1 corresponds to a PM jet and d_k >  1 to an OP jet). The upper row spans the entire simulation grid whereas the bottom row shows a magnified view of the nozzle region (−7 <  z/R_j <  7). The white lines in the bottom row show stream lines visualising the direction of the flow and the bold dashed lines correspond to the inward travelling and reflected shock wave.