Distributions of concentration and density parameters in five bins of redshift and luminosity, after taking account of selection effects and the luminosity function. Shown are the distributions (median and 1σ range) for normal, skew normal, and interpolated PDFs. The edges of the redshift bins are 0.0, 0.1, 0.2, 0.3, 0.4, and 1.5. The edges of the luminosity bins are 41.1, 43.3, 43.7, 44.0, 44.3, and 45.6 log erg s⁻¹.