Stellar mass-weighted age-velocity dispersion components (σ_R, σ_ϕ and σ_z in different columns) for stars at different Galactocentric radii. The top, middle and bottom panels correspond to the all-stars, high- and low-α populations, respectively. The colour of lines corresponds to the relations for stars at different Galactocentric radii, where the black colour marks the solar radius (≈8 kpc).