a) Posterior draws from MultiNest (black) and comparison with the point estimates from Ueda et al. (2014) (blue), Miyaji et al. (2015) (green), Aird et al. (2015) (red). b) Comparison of 5−10 keV luminosity function (black line) transformed to 2−10 keV to literature results. The gray area shows the 90% credible interval. Our result is in excellent agreement with the literature up to z = 2.5. At high redshift our result shows a less prominent drop in the faint end of the XLF compared to estimations from Miyaji et al. (2015) (green), Aird et al. (2015) (red), and Georgakakis et al. (2015) (thin black line).