Fig. 8. a Particle plots of the stars (left) and the gas (right) for the disk-dominated run, at successive epochs 200 to 800 Myr by 200 Myr. Particles are plotted until a radius of 6.25 kpc. The majority of stars rotate in the direct sense (counterclockwise), while the gas is retrograde. b The halo-dominated run, at successive epochs 200, 400 Myr then 1400, 1600 Myr.