Velocity dispersions (radial, azimuthal, and vertical in the first, second, and third panels) and average age (fourth panel) as a function of metallicity for different galactocentric guiding radii, R_g, as annotated by the legend. The ‘X’ symbols are located at the ISM’s metallicity at the considered position, assuming the metallicity gradient derived from classical Cepheids and open clusters from da Silva et al. (2023). The thickness of the line corresponds to the uncertainty on the measurement. The step in metallicity used to compute the trends is 0.1 dex.