Heliocentric radial velocity V_H – K-magnitude (as a proxy of the star-Sun distance) density distributions along the bulge minor axis at b = − 4°, − 6°, − 8°, and − 10°. The size of the fields is Δl = Δb = 1° for b ≥ −6° and for b< − 6°. For each field we show first, all stars of the modelled galaxy, and then stars selected on their birth radii according to: r_ini< 2.5 kpc , 2.5 kpc ≤r_ini< 4.5 kpc, and r_ini ≥ 4.5 kpc. Only disk stars with | x | ≤ 2.5 kpc and | y | ≤ 3 kpc were selected.