Colours for the ERCSC galaxies (black dots) compared to those found for SLUGS galaxies (red; Dunne & Eales 2001; Vlahakis et al. 2005) and ULIRGs (blue; Clements et al. 2010b). A flux correction factor of 0.506 has been applied to the Planck 857GHz (350 μm) flux densities to extrapolate them to the SCUBA 450μm band. This correction is appropriate for sources with the SLUGS median galaxy SED i.e. T = 35 K and β = 1.3, but this factor will be similar for most reasonable dust SEDs. Only sources detected at >3σ in the 353GHz (850μm) band and at >5σ in the 857GHz (350 μm) band (the requirement for inclusion in our analysis) are shown. The four points above the general trend in the lower left of the diagram are bright non-thermal dominated sources 3C279, [HB89]0537 − 441, OJ + 287 and 3C273. The SLUGS point with the lowest 60μm to SCUBA flux ratios corresponds to the galaxy IC979; it is offset from the general correlation for SLUGS and ERCSC galaxies, and Vlahakis et al. (2005) note that its IRAS flux densities should be treated with caution.
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