Spectral energy distribution of η Carinae. The black crosses show our Herschel fluxes. The 70   μm and 160   μm PACS fluxes represent upper limits. The black triangle shows our LABOCA 870   μm flux determined in Preibisch et al. (2011c). The blue diamonds are the data from Cox et al. (1995). The dashed line represents the sum of two modified Planck spectra for dust temperatures of 210 K and 430 K from the model of Cox et al. (1995), the solid line the sum of three Planck spectra for dust temperatures of 140 K, 200 K, and 400 K from the model of Smith et al. (2003). We note that for wavelengths above  ≥ 500   μm the SED gets dominated by free-free emission of the Homunculus nebula and the radiation originating in the ionized stellar wind of η Car.