Joint posterior distribution in the log N_H − log L_6 μm plane (shaded blue region) for source lid_1278, one of our CTK candidates. The IR luminosity L_6 μm is inferred from the X-ray luminosity posterior via the Stern (2015) relation. The dashed black line and the shaded grey region show the SED-inferred L_6 μm value and its uncertainty, while the red dotted contours indicate the posterior distribution after incorporating the IR prior.