Rotation curve of thin-disc stars (left panel), intermediate-disc stars (middle panel) and thick-disc stars (right panel) of the N-body disc galaxy model (thin+thick simulation). Stars at |x| ≤ 2.5 kpc and |y| ≤ 3 kpc from the Galactic centre are selected. Different latitudes are shown for the modelled galaxy: b = 0°, − 2°, − 4°, − 6°, − 8°, and − 10°. The size of the fields is Δl = Δb = 1. °5.