Simulated sample. Solid lines show the distribution in the luminosity, halo mass, stellar mass-to-light ratio, and half-light radius of the general population of foreground galaxies as well as the distribution in redshift and i-band magnitude of the general population of background sources. Contour levels correspond to 68% and 95% enclosed probability. Pink points show the values of the above quantities, as well as of the Einstein radius, of the strong lenses. Histograms are normalised to one.