Top: radial, azimuthal, and vertical velocities V_r, V_ϕ, and V_Z as a function of age for the HQS with the Galactocentric radius shown with colours as indicated in the colour bar. Bottom: distribution of V_r, V_ϕ, and V_Z of the OCs in different age bins. In each panel, the mode of the distribution is marked with a vertical orange line, and the azimuthal velocity of the LSR is marked with a vertical green line in the middle column.