The Temperature-Temperature plane for two temperature component fits for ERCSC-IIFSCz matched galaxies. together with data from Dunne & Eales (2001) and Clements et al. (2010b) for SCUBA observed sources (triangles and squares respectively). Only those ERCSC-IIFSCz sources where the two temperature model is preferred and with a reliably determined cold dust component temperature (i.e., T/σ(T) > 4) are plotted. The sources with the coldest T_cold < 7K in this plot are dominated by non-thermal emission.