Spectral energy distributions for the four filaments derived by a simultaneous fit of the profiles for unconstrained distances assuming for the dust emission spectra a modified black body. The theoretical flux densities of the SPIRE filters (grey filled circles) correspond to the best fit (black line). The vertical lines mark the uncertainties of the theoretical fluxes of the broad band filters and the horizontal lines the filter widths. The grey shaded areas show the 1σ uncertainties of the SED.