Luminosity-weighted mean age (left panels) and mean stellar metallicity (right panels) as a function of stellar velocity dispersion for LEGA-C silver galaxies. Upper panels: Data points colour-coded by their SSFR after applying LOESS-smoothing. The black vectors in the bottom-right corner are proportional to the partial correlation coefficients computed as in Scholz-Díaz et al. (2024), and the red vector indicates the direction of maximal increase of SSFR. The grey vectors indicate a reference correlation coefficient of 0.7. Middle panels: Q galaxies (circles) and SF galaxies (stars), colour-coded by their individual SSFR. The filled symbols highlight galaxies in the golden subsample. The median trends in bins of σ_* (0.1 dex wide and with at least 5 galaxies) are shown by grey (black) squares for the weighted silver (non weighted golden) sample. The linear fits to the median silver points are shown by solid lines (dashed lines for the extrapolation outside the median data points). Bottom panels: comparison of the median trends for Q (magenta) and SF galaxies (blue) in the silver sample. The error bars represent the 16–84 percentile range of each distribution.