IRAC SEDs: sources with a small flux increase 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 gradient between the 8 and the 24 μm flux and the source at the top is the one with the shallowest gradient. Effective flux values can be recovered from Table 1. All sources except s16 show a monotonic increase of the mid-IR flux between 3.6 and 24 μm. The 24 μm flux for s20 is below threshold.