Subset from the 20 A_V-normalised dust SEDs in Planck Collaboration Int. XXIX (2014). Each U_min, i.e. each temperature, is shown in a different colour and line style. For clarity of illustration, only five of the 20 SEDs are shown: the warmest and coldest overall SEDs, the warmest and coldest of the SEDs that are within a standard deviation from the average U_min, and the median SED. Symbols indicate the central band wavelengths; error bars indicate the dispersion for each band flux, while instrumental noise is negligible.