Size–luminosity relations for elliptical, cD, cE and dE galaxies, and bulges of lenticulars and spirals. Left: size–luminosity relation for the single-Sérsic fits to the E, cD, cE and dE galaxies color-coded by type (with effective radius and absolute magnitude as measures of the size and luminosity respectively), and their corresponding linear fits. A second order fit for E galaxies (thick dark red line) is also plotted. Right: size–luminosity relation for the Sérsic components of E and cD types and the bulges of lenticular and spiral types with Inclination ≤ 2. The color of the points represent B/T_g, the bulge-to-total luminosity ratio in the g band. The solid black line is the second degree polynomial fit to all points. In both panels, the dashed gray lines are the historical fits from Binggeli et al. (1984), using the intercepts defined in the text.