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Fig. 5

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Luminosity of our stars versus their Teff (essentially the HRD). The different spectral types are color-coded as in the previous figures. We indicate the composite objects with an additional orange circle around the symbols. The evolutionary tracks are the same as in the Kiel diagram (Fig. 2). The four luminous post-AGB stars noted in Sect. 4.1.1 are outside the luminosity range shown here.

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