Normalized histogram of the ratios of the galactic effective radius R_e, g to the point spread function PSF (full width at the half maximum) for our sample of galaxies (long-dashed line). The short-dashed line indicates the normalized histograms of the optical radius R₂₅ to the PSF ratios. The solid line denotes the histogram of the radii (expressed in units of PSF) up to which the measurements are available.