Azimuthally averaged radial profiles of metallicity (upper panels) and surface brightness (lower panels) of the sample galaxies. Surface-brightness error bars are smaller than symbols. The surface brightness level at which sky subtraction uncertainties become dominant is μ_r ≥ 26 mag arcsec⁻² for all the galaxies. The vertical dotted and dashed lines correspond to the transition radii R_tr, 1 and R_tr, 2, respectively, while the grey shaded areas mark the transition regions between different components of the fit. The red and magenta lines indicate the fit to the central and intermediate regions with a Sérsic profile, while the blue line indicates the fit to the outermost regions. The black line indicates the sum of the best-fitting components. The total stellar mass of each galaxy is given.