AGN classification based on X/O and X/NIR ratios. The left panel illustrates the relationship between X-ray flux (0.2–12 keV) and R_C magnitude. Dashed lines represent the thresholds for log(X/O) > −1 and log(X/O) > 1, with objects above log(X/O) > −1 classified as AGN. Red circles highlight points meeting the AGN criterion L_X > 3 × 10⁴² erg s⁻¹ of Xue et al. (2011). Colour coding indicates the spectroscopic redshift of the objects. The right panel displays the X-ray flux plotted against K_s magnitude. Objects above the log(X/NIR) > −1.2 threshold are categorised as AGN. Red circles and colour-coding are the same as in the left panel.