IRAC SEDs: sources with a large flux growth between 4.5 and at 8 μm. The plot shows the sources from bottom to top scaling the fluxes so that the source at the bottom is the one with the steepest slope between the 8 and the 24 μm flux, the source at the top is the one with the shallowest gradient. Effective flux values can be recovered from Table 1. Open dots are used for sources that do not show a noticeable decrease of the flux between 3.6 and 4.5 μm.