Fig. 1.
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Far-infrared and submm colour-colour diagram (S870 μm/S500 μm vs. S250 μm/S500 μm), colour-coded by redshift. The brightest known sources from the Herschel, Planck, and SPT surveys are shown with circular, triangular, and rhomboidal symbols, respectively. J154506 is highlighted with a red star. Flux densities at 850 μm (rather than at 870 μm) are used for the Herschel and Planck sources. The extremely red S250 μm/S500 μm colour of J154506 suggests a redshift of z > 3.
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