Revised Spitzer/IRAC criteria from Donley et al. (2012) to separate AGNs from SFGs. The x axis shows the ratio between the flux in the 5.8 μm band and the flux in the 3.6 μm band, while the y axis depicts the ratio between the flux in the 8.0 μm band and the flux in the 4.5 μm band. Grey dots are all the sources in the OTELO catalogue with information in the four IRAC bands. Black dashed lines correspond to the limits set by Donley et al. (2012) to select AGNs. Red circled sources are the 15 sources selected as AGNs in this way.