Colour − colour diagram of the Herschel-ATLAS sources (Amblard et al. 2010). The coloured background indicates the average redshift for 106 randomly generated model SEDs. The SPIRE colours of background sources can be overplotted to determine their redshift. Other object types (e.g. the debris disk itself) should not be overplotted. The small crosses are the 1947 galaxies detected in the context of the ATLAS open-time key programme (with a significance greater than 5σ at 350 μm and 3σ at 250 and 500 μm). The overplotted rectangle indicates the position of the blob in this colour − colour space. The redshift in this rectangle lies between 0.78 and 2.6.
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