Comparison of the profiles obtained from simulations at the resolution of 20 and 40 cells/r_j. Left panel: Lorentz factor evolution up to 1.2 pc for models FMH1 and NIH4. Right panel: Half-opening angle obtained in the same models. Blue lines are for model NIH4 (continuous - 40 cells/r_j; dotted - 20 cells/r_j) while green lines are for model FMH1 (same line-style scheme). The comparison shows how the resolution of 20 cells/r_j is enough to reach the saturation point, allowing us to use this resolution value for our simulations.