X-ray full-band flux vs. r-band (top panel), J-band (middle panel), and 4.5 μm-band (bottom panel) AB magnitudes. Black dots represent the main catalog sources, while red stars represent the known stars of our catalog. The blue diagonal dashed lines show constant X-ray to r-, J-, or 4.5 μm-band flux ratios log(f_X/f_opt) = − 1,   + 1, while the blue diagonal solid line shows log(f_X/f_opt) = 0. The yellow shaded region highlights the area between the blue diagonal dashed lines that, for the optical bands, represents the “classic locus” of unobscured AGNs.