Dynamical characteristics showing the formation of a wing-lobe structure for case 3Dmaj_ref. Left: 2D slice of our simulated 3D structure (at x = 0) representing the density distribution in the y − z plane. The formation of a prominent wing structure along the z-axis can be observed here. Right: velocity-distribution map (v_y) of the bi-directional jet, representing the same structure as the left one but viewed at an angle to the jet ejection axis. Both of these structures have a dynamical age of 3.91 Myr. The measure of velocity, density, and length are represented here with respect to the light speed (c), unit density (ρ₀ i.e. 1 amu/cc), and unit length ( i.e. 4 kpc), respectively.