Spectral energy distribution of η Carinae obtained by likelihood analysis (points). The error bars are of 1σ type and only reflect the statistical uncertainties. The upper limits (represented by arrows) have been determined such that the difference of the logarithmic likelihood values (with and without an additional trial point source at the indicated flux value) correspond to 1σ. The line depicts the best fit of the spectral model that best describing the spectra. Left: representing the full orbit dataset. Right: representing 500 days centered on the periastron passage (blue) and the apastron passage (red).