R_sSFR/R_norm as a function of stellar mass. The two shaded grey regions show limits on the measurements of R_sSFR/R_norm. We have excluded any galaxies where the sSFR profile spans fewer than three data points, so the dashed black line has R_sSFR = 6.545″. In principle, any sSFR profile with more than three data points could still have a truncation at the first data point, so the dash-dotted line has R_sSFR = 2.805″. In both cases, R_norm is determined from the size mass relation in Fig. 4 at a distance of 16.5 Mpc.