Figure 7: The left panel shows streamlines of selected tracer particles advecting through the shock wave to the PNS seen from the polar direction in our 3D model [139]. Several surfaces of constant entropy marking the position of the shock wave (greenish outside) and the PNS (indicated by the central sphere) are shown with the linear scale given in the right-bottom edge. The right panel shows the number of tracer-particles travelling in the gain region as a function of their individual residency time between the 2D and 3D model, at 100 ms after bounce. If the left panel were for 2D models, the streamlines would be seen as a superposition of circles with different diameters. The maximum residency timescale for the 3D model is shown to be longer than that in the corresponding 2D model. These figures are taken from [139].