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Fig. 2

image

Parameter space (Teff, log g, [Fe/H]) covered by the compiled sample of spectra. Highlighted by salmon and red circles are the Cepheids ζ Gem and l Car, for which we have the most spectra at hand (135 and 191, respectively). Gray squares indicate a small portion of the giants used in the ATHOS dataset for stable stars (H18).

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