Example for the estimation of the uncertainty in SPD shape for star HD 109995. Top panel: l1-normalised SPDs from four different libraries, plus the derived mean SPD, μ(λ). The passbands for BT and VT according to ESA (1997) are shown schematically for comparison. Central and bottom panels: first and second eigenfunctions, φ1(λ) and φ2(λ), derived from the four spectra of HD 109995.
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