Density distribution (left) and galactocentric radial velocities (right) of the gaiauriga mock stellar catalogue for young (top) and old (bottom) sources. The black lines outline the contours of the density distribution. The black dot indicates the Galactic centre, the yellow star the Sun’s position. The dashed black lines mark concentric circles at ΔR = 2 kpc. The v̄_R> feature for R ≲ 5 kpc in the right panels is due to the effect of the bar on the kinematics of sources in the inner galaxy. The solid lines indicate constant Galactic longitudes.