SLACS lenses and parent population. Distribution in redshift, observed stellar mass, half-light radius, and stellar velocity dispersion. The green contours and histograms are obtained by weighting the parent sample distribution by σ_ap⁴. Vertical dashed or dotted lines indicate the median of the distributions of the corresponding colour. Contours enclose 68% and 95% of the distribution. Half-light radius measurements of the parent population were not used in our analysis. Instead, we assumed a stellar mass-size relation from Hyde & Bernardi (2009), which is shown as a dashed red line. The black line in the redshift-stellar mass panel is the inferred truncation stellar mass m_t, introduced in section 4.2.