MBB fits to Planck data averaged within 8′ of the centre of the SCUBA-2 fields. The wavelength range is either 350–850 μm or 350–1380 μm. Each marker corresponds to one field, and the dotted lines connect estimates of the same field. The median values are plotted with large symbols, and they are quoted in the frame together with the 1σ dispersion estimated from the interquartile ranges. The plot assumes the default CO corrections.