Posterior probability distribution of the parameters describing the distribution in M_h and Υ_* of the galaxy population, obtained by fitting the simulated sample of 137 strong lenses with the model of Sect. 4. Solid black contours show the inference obtained with no individual source redshift information. Red filled contours show the inference obtained with known individual source redshifts. Dashed black lines mark the true values of the parameters. Dotted green lines indicate the values of the parameters obtained by fitting the model to the subsample of strong lenses.