Three-dimensional isosurfaces of Lorentz factor at the end of the simulations. The top left panel represents Case A at t = 23 000, the top right panel represents Case B at t = 12 000, the bottom left panel represents Case C at t = 42 000, and finally, the bottom right panel represents Case D at t = 48 000. In each panel the top portions display the entire jet while the bottom portions display the last section of the jet between y = 400 and y = 600. The three isosurfaces are for γ = 1.1, 3, 5.