Very-low-metallicity stars (same as Fig. 6) for the boxy/peanut bulge model under the decelerating bar at T = 3 Gyr and T = 5 Gyr, respectively. In the central row, we plot the distribution for the low-metallicity particles with J_ϕ > 1000 km s⁻¹ kpc. The bottom row shows the particles with J_ϕ > 1000 km s⁻¹ kpc & J_z < 100 km s⁻¹ kpc. The orange dot in the right panel marks the position of the Sun and the two dashed curves denote the distances at 4 and 6 kpc from the Sun. The pseudo-stars in the central region of the Galaxy evolve sharply within the simulation time. Some of these stars are driven outwards by the decelerating bar with the co-rotation trapping. It is clear that at T = 5 Gyr, about 6000 pseudo-stars show a feature of rotationdominated orbits with very low metallicities.