[O III] flux ratios based on SDSS (left panel) and LBT (middle panel) spectroscopy for the two nuclei as a function of separation. The 2–10 keV X-ray luminosities based on Chandra observations are compared to the [O III] luminosities for three of the sources in the right panel. The secondary nuclei are undetected in X-rays and 5σ upper limits on the X-ray luminosity are provided in these cases and shown as unfilled symbols. The dashed line shows the correlation determined by Ueda et al. (2015) for a large sample of obscured (type 2) AGN as a reference.