Observed surface brightness profiles for each band of the sample as a function of the semimajor axis of the ellipses. The dashed gray line is the R₂₅ and the dashed black line is the R_UV defined in Section 3.3.1. For clarity, an offset have been applied on the profiles of +n magnitudes/arcsec² with a dependence on the bands indicated in the bottom right panel. The dotted blue line represents 25 mag.arcsec⁻² in the B band adapted to the g band using Fukugita et al. (1995).