Flowchart of the classification scheme, summarizing the sequence of criteria used to separate the stars into the bar, spheroidal bulge, and inner-thick disc components. The classification scheme first relies on the robust identification of the bar-supporting stars with a probabilistic approach. Subsequently, the X₄ or the long- and short-axis tube orbits are extracted. Finally, the spheroidal bulge and the inner thick disc stars are classified based on the L_zni, i.e. the net rotation parameter.