Redshift and flux distribution histograms. (a) Redshift histogram of the spec-z (dark blue histogram) and photo-z (red histogram) samples, where the latter is stacked onto the former. The model expected redshift distribution of AGNs obtained with the X-ray luminosity function model by Miyaji et al. (2015) for our Chandra ANEPD survey is overplotted. (b) X-ray (0.5–7 keV) [S_X(0.5–7 keV)] histogram of the X-ray sources in our ID catalog. In addition to the histograms for spec-z and photo-z samples, the distribution of Milky Way (MW) objects is also shown (orange histogram, stacked). The distribution of all objects in our sample is also shown as an un-filled histogram. (c, d) Histograms of g and K_s magnitudes for the X-ray sources that are detected in respective bands. The meaning of colors and styles of the histogram are the same as those in panel (b).