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Fig. A.3.

image

Spectrum of the sub-subgiant with ACS Id #13438. Top panel: one normalised observed spectrum in blue and the best-fitting PHOENIX spectrum offset by 0.3 in orange. Bottom panel: residuals after subtracting the best fit from the data. Right panels: zoom at the Hβ and Hα line with a filled-in observed Hα line in contrast to the best fit (not offset).

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