ROC curves for the default CIGALE configuration and different model choices (see Appendix C), showing the performance of AGNFRAC as a classifier for AGN selection. The comparison is made between sources with poor-to-moderate infrared quality (FLAGINFRARED ≤2, left) and those with high-quality WISE photometry (FLAGINFRARED = 4, right). Colored points indicate AGNFRAC thresholds.