R_edge–stellar mass (left) and Σ_⋆(R_edge)–stellar mass (right) relations derived in this work. Only those galaxies where an edge was identified are plotted (624 objects). The grey lines in the R_edge–stellar mass planes are lines of constant stellar mass surface density within the R_edge of the object. Top to bottom: each row shows the same observed relations (top), colour coded according to the morphology of the galaxies, (g − r)_edge and a proxy for the age at R_edge, for a fixed metallicity [M/H]= − 0.71. We plot the uncertainties in our measurements (see Sect. 4) only in the second row for clarity in the other panels.