Angular momentum distribution of the thin (blue) and thick (red) disc particles. Left: particles are chosen from a region including the disc and bar, i.e. x = 3.2–3.5 kpc, z = 0.2–0.5 kpc, and y = − 8–8 kpc (unshaded region of Fig. 2). In these plots the foreground and background disc contamination are explicitly included. Right: angular momentum distribution of the thin (blue) and thick (red) disc particles in the bar-b/p region, i.e. x = 3.2–3.5 kpc, z = 0.2–0.5 kpc, and y = − 1–1 kpc (shaded region in Fig. 2). The top row shows the angular momenta for the first snapshot when the disc is axisymmetric, i.e. before the bar and b/p bulge form, while the bottom row shows the angular momenta after bar and b/p formation. Focusing on the particles in the bar/bulge region after the bar and b/p form (bottom right panel), we note that the thick disc particles have a tail of higher angular momentum than the thin disc stars.