IRAC+MIPS (IM) IR criteria by Messias et al. (2012) to select AGNs. Grey dots are all the OTELO sources with information in the four IRAC bands as well as in the K_s and [24] μm bands. Black dashed lines are the limits of the IM criterion (see Eq. (5)). Purple crosses represent the objects fulfilling the IM criterion. Orange circled sources represent the sources satisfying, in addition, that K_s − [4.5] > 0, i.e., the KIM (K_s+IRAC+MIPS) criterion. These are the objects selected as AGNs by the KIM criterion (24 sources).