Metallicity of stars in our sample versus component of angular momentum perpendicular to disc plane for three different slices in the maximum absolute height over the Galactic plane reached by the star orbit. Points are colour-coded according to the orbital eccentricity. The thin black lines are at L_Z = ±500 km s⁻¹ kpc, while the grey line marks the Z angular momentum of the Sun: L_Z = 1909 km s⁻¹ kpc in the adopted reference frame. The sub-samples plotted in the various panels contain 185 178, 580 551, and 104 530 stars, respectively, from top to bottom.