Absorbed fraction versus 2–10 keV luminosity. Black points are the result of this work, taking selection effects into account; the vertical error bars show 68.3% credible intervals, and the horizontal error bars show the binning. The blue points are the results of Ueda et al. (2014) for low-redshift sources, and the orange area shows the results of Burlon et al. (2011). The gray area is the observed luminosity distribution in our sample.