Surface density contour plot of an edge-on slice (∣y∣ < 2 kpc) of the dark matter halo in the prograde model at t = 7.0 Gyr. The dark matter particle values are marked by rainbow contours. Stellar particles are indicated by the black dashed contours. The increasing contours of the stellar bar match the levels on the first four dark matter halo contours but are larger by an order of magnitude.