Left panels: distribution of jet pressure P/P₀ in the Y − Z plane of the models UNI-B at t/t_a = 3.75 (top), UNI-C at t/t_a = 5.59 (middle), and UNI-D at t/t_a = 10.61 (bottom). Right panels: distribution of the vorticity along the normal to the Y − Z plane (∇×v)_x for the corresponding cases at the same times. The color bars in the left and right panels represent the corresponding pressure and vorticity in code units, respectively. The tracer contours at level 0.8 are overplotted as black lines to demarcate the jet boundary in all three cases. The tracer levels close to the jet axis are greater than 0.8 and are not shown here.