Fraction of stars (orbital time steps) along Y-symmetric APOGEE orbits with |Z|< 0.75 kpc, in different [Fe/H] and age bins that constitute the disc, ring, and bar. The black curves show the orbital density maps built from all disc and ring stars (Ecc < 0.4) and all bar stars (Ecc ≥ 0.4). The fraction at each position of stars in each [Fe/H] and age bin (rows) composing each structure is shown by the colour. For other plot details see Fig. 2.