The comparison between different estimations of the half-luminosity radii of all galaxies with HST photometry and a measured velocity dispersion. We plot the ratio of the harmonic radius (a_eb_e)^1/2 to the circularized effective radius R_e of the best-fit HST B+D model (top), the ratio of the circularized effective radius R_e(Ser) of the Sersic fit to R_e (middle), and the ratio of the circularized effective radius R_e(VLT) of the best-fit VLT B+D model to R_e (bottom) as a function of 1 − b_e/a_e. Symbols and color coding are as in Fig. 4.