Evolution of light concentration in galaxies computed from the ratio of the non-parametric radii enclosing 80% and 20% of the total flux, as defined in Sect. 4. The solid line is a linear fit to all the small blue points. Each galaxy is plotted with a small blue point (squares for redshift confidence 2 and 9, circles for 3 and 4). The median values and respective error () per redshift bin are shown as large blue points with error bars. The shaded region delimits the 16th and 84th percentiles including 68% of the sample in each redshift bin. The orange diamonds are the values obtained with the stacked images computed from the method described in Sect. 5.