SED of source lid_1278 (z = 3.013), one of the CTK AGN candidates in our sample. The colour-coded symbols show the observed photometry from CFHT-MegaCam (purple), Subaru-HSC (blue), VISTA (green), Spitzer/IRAC (orange), and Spitzer/MIPS (red). The solid black line indicates the best-fitting total model from CIGALE, decomposed into the AGN (disc + torus; dashed red line) and host-galaxy (stars + dust; dotted grey line) components. The predicted 6 μm flux derived from the X-ray luminosity is also shown (red cross). The best-fitting parameters are reported in the legend, including inclination angle and AGN fractional contribution.