Relationships between the (resolved) continuum luminosities at rest-frame 341 GHz (880 μm), 750 GHz (400 μm), 808 GHz (370 μm), and 1160 GHz (260 μm) for galaxies W (red circles) and T (blue circles). The two maps used for each panel were convolved to a common resolution. Each data point was calculated over an aperture equivalent to the FWHM of the synthesised beam, with apertures spaced by half a synthesised beam; i.e. roughly a quarter of the data points are independent measurements. Error bars for each point are shown in light red and light blue for galaxies W and T, respectively. The solid lines in the corresponding colour delineate the linear fits to the data; the coefficients of these fits (slope, intercept) are listed in the panel in the corresponding colour. The grey lines show the expected relationships for greybody emission (with β = 2.0) for dust at temperature, T_dust = 40 K (solid) and 36 K (dashed), the estimated dust temperatures derived by I13 for W and T, respectively.