MIR and near-IR colour-colour diagrams and the selection of AGNs for different photometric methods of L04 (dashed lines) and Ch17 (dot-dashed lines, left panel), S05 (middle panel), and M12 (right panel). The vertical bar represents the fraction of objects with good redshift estimates (zCOSMOS-good) and the sample of objects within the MIR and near-IR limiting magnitudes and with 0.3≤ z_phot ≤ 0.9.