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Fig. 1

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Top panel: observed profiles of Hβ in HE 22524225 (bold dots) and HD 122563 (continuous curve). Middle and bottom panels: synthetic NLTE (continuous curve) and LTE (dashed curve) flux profile of Hα and Hβ computed for Teff = 4710 K compared to the observed spectrum of HE 22524225 (bold dots). In all calculations, log g = 1.65, [ Fe /H ] = −2.66, and ξ = 1.7 km s-1.

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