Top: (2–10) keV band absorption corrected luminosity versus the equivalent radius to the contour corresponding to 3σ times the background, R_eq. Bottom: the same for the equivalent radius of the level corresponding to 2.9 × 10^-9 erg s^-1 cm^-2 arcsec^-2, R^∗_eq. The equivalent radii are derived thought narrow band HST images. The unbroken lines show the best linear fit to all the galaxies excluding disky systems. The dashed lines show the best linear fit to the core-halo systems.