Accuracy of the flux determination for the dataset described in Fig. 19: measured Herschel 500 μm (FWHM = 36′′) fluxes f₅₀₀ are compared to the fluxes obtained for the SCUBA-2 450 μm (FWHM = 7.5′′) f₄₅₀, considered as reference fluxes (using 24 + 850 μm unresolved priors in both cases). The symbols have the same meaning as in Fig. 11; the error bars now include the measured error on the reference flux. See text for more details.