Radial luminosity profile of NGC 522 (yellow symbols) and fits to it. The vertical red bars indicate the limits of the fit in CO12. The dotted lines indicate the fitted profile and the break radii in CO12. The continuous lines indicate the fitted profile and the break radii in this paper. The dashed profiles indicate the CMC and the disc contributions. The units in the inset axes are arcseconds. The inset image is unmasked and covers the [−z_u,z_u] vertical range.