The log  (r_med) of the size distribution as a function of absolute magnitude for late-type galaxies (left panels) and early-types galaxies (right panels). The abscissas are the median and the horizontal error bars are the 25% and 75% quartiles of the absolute magnitude distribution within each luminosity bin. Vertical error bars are the 1σ error estimates derived from the fitting procedure. Continuous lines are the best-fit quadratic models. Inset panels show the results of using C > 3 to define early-type galaxies.