Left-side panel: Petrosian half-light radius r₅₀ as a function of stellar mass for the total sample of galaxies. Points represent the median in each bin. Vertical error bars are obtained by using the bootstrap resampling technique. Right-side panel shows the confidence test for the total sample (continuous lines) and for a subsample of galaxies with log (M_∗) ≧ 10.7 (dash dotted lines). Symbol types as in Fig. 3.