Evolution of cases E and F. The three panels on the left are for case E at times respectively 9.6 × 10⁵ yr, 1.8 × 10⁶ yr, and 2.6 × 10⁶ yr, from top to bottom, while the three panels on the right are for case F at times respectively 9.6 × 10⁵ yr, 1.6 × 10⁶ yr, 2.3 × 10⁶ yr, from top to bottom. The distribution of y velocity component is represented by a volume rendering, with blue colors representing negative values and red-yellow colors representing positive values. Superimposed, we also show a cut of the density distribution in the x-y plane, while the blue lines are density iso-contours at ρ = 0.2 cm^-3 on the same plane.