Dependence of the match percentage with the number of counts in the X-ray spectra for the hydrogen column density (left column) and the intrinsic 2-10 keV luminosity (right column). The top, middle, and bottom rows correspond to the results for sources with log N_H = 21.5, 23.5, 24.5, respectively (black circles). In all panels also included are the results for the total sample, without splitting in log N_H (grey triangles). The error bars correspond to one-sigma uncertainties, calculated through bootstrapping.