Final J_ϕ-J_z distribution for both the simulation result with a decelerating bar (with a boxy/peanut bulge) and the observational data, shown in the upper panel. The contours show the distribution for very metal-poor pseudo-stars, with a clear bi-modal distribution. The pseudo-stars with J_ϕ > 1000 denote the population that is driven outwards by the decelerating bar. The black box represents the selection criteria and the blue stars represent the same stars as those plotted in Figure 10. The simulation result coincides with the observations well. In order to make a comparison with another bulge model, the result from another experiment with a spheroidal bulge is shown in the lower panel. The bi-modality distribution is still clear in this second experiment.