Left panel: normalized distributions of the 0.3−7 KeV count-rate for Roma-BZCAT (top) and ABC (bottom) sources. The various subclasses of Roma-BZCAT sources and types of ABC sources are presented with the colors indicated in the legend, and the white histograms on the background represent the distribution of the whole samples. For Roma-BZCAT sources, gaussian fits to the subclass distributions are indicated with dashed lines of the respective colors, while for ABC sources a gaussian fit to the distribution of the whole sample is indicated with a black dashed line. Right panel: same as the right panel, but for the distributions of the X-ray slope Γ_X.