Ratio of the observed and colour-corrected (cc) scan map photometry fluxes with either the photometric standard model flux or the Gordon et al. (2007) 70 μm flux prediction and Rayleigh-Jeans extrapolation (red diamonds). The uncertainty of the models is shown by the light blue range, the uncertainty of the flux prediction and the Rayleigh-Jeans extrapolation by the dark blue range. The uncertainty of the flux ratio includes the absolute photometric error of the measurement.