Upper panel: flux density spectrum of integrated emission of Mrk 266, containing both NE and SW nuclei. Data from XMM-Newton (blue) and NuSTAR (red squares) are plotted. The flux density is in units of 10⁻¹⁴ erg s⁻¹ cm⁻² keV⁻¹. For display purposes, the NuSTAR data used for the spectral analysis were rebinned further. The Fe K emission line feature at 6.5 keV is marked. Bottom panel: spectra of the NE and SW nuclei obtained from the Chandra ACIS. Since Fe K line emission is absent in the NE spectrum (the line energy is denoted by the vertical dotted line), the Fe K line seen in the XMM-Newton and NuSTAR spectra seems to originate predominantly from the SW.