Spatial density of disk effective radius for EFIGI morphological types grouped as S0⁻-Sab, Sb-Sdm, Sm-Im (the effective radii of single-Sérsic fits are used for the Im), compared to the expected density from the bi-variate luminosity-disk radius function proposed by de Jong & Lacey (2000) for a sample of ∼1007 Sb-Sdm galaxies. For each magnitude interval, its mean magnitude is used to derive the plotted analytical curve.