Very-low-metallicity stars ([Fe/H] ≤ −2.5) for the boxy/peanut bulge model in the constant rotating bar at T = 3 Gyr and T = 5 Gyr in the middle and right panels, respectively. The central row is colour-coded by J_ϕ. The bottom row shows the low-metallicity particles with J_z < 100 km s⁻¹ kpc. The orange dot in the right panel marks the position of the Sun, while the two dashed curves denote the distances at 4 and 6 kpc from the Sun. The thick line denotes the direction of major axis of the bar at T = 5 Gyr. Within this constant bar model, no test particles can exceed a value of 1000 km s⁻¹ kpc for the value of J_ϕ.