Hardness ratio as a function of hard X-ray luminosity for all MIR matches (open circles). Sources classified as obscured and unobscured sources are plotted with filled circles and triangles, respectively. Vertical dashed lines show the typical separation for normal galaxies, Seyfert-like galaxies and quasars used in the X-rays. The dashed horizontal line shows the HR value for a source with N_H> 10^21.6 cm² at z> 1. In the upper panel we plot the hard X-ray luminosity distribution for all the sources (solid line histogram) and dashed histogram represent the corresponding distribution for MIR selected AGNs (obscured and unobscured samples). For a better comparison, the AGN hard X-ray luminosity (shade histogram) have been scaled up by a factor of two to show their relative values compared to the whole sample of X-ray source detections.