Intrinsic X-ray luminosity in the 2−10 keV band versus the monochromatic 6 μm luminosity of the AGN component. The results for our CTK sample are shown before (left panel) and after (right panel) applying the IR luminosity prior, as described in Sect. 3.2. Grey dots represent the X-ray–selected AGN sample from Laloux et al. (2023) in the CCLS field. Large circles indicate our final CTK candidates, colour-coded by their parent X-ray survey: CDF (yellow), CCLS (red), XXL-N (blue). The dashed black line marks the L_X − L_6 μm relation from Stern (2015), while the dashed grey lines denote the 2σ dispersion of the Laloux et al. (2023) sample with respect to that relation.