Fig. A.1

Images of the reliable (i.e., reliability >90%) counterparts of IFRSs identified in CDFS, ELAIS-S1, and ELAIS-N1 fields. Also reported are the counterparts for the sources ES0436 and ES0593, which are probably not AGN-driven as their R3.6 are around 57. All the images are ~40″ × 40″ wide, North is up and East on the left. The (inverted colours) black-and-white background images are SERVS cutouts, taken from the 3.6 or the 4.5 μm mosaics (depending on which band the reliability has been computed). Superimposed are a red cross (marking the radio peak position, always at the centre of the cutout), and a cyan circle (marking the area within which aperture photometry was derived).
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