Top panel: observed profiles of Hβ in HE 2252−4225 (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 2252−4225 (bold dots). In all calculations, log g = 1.65, [ Fe /H ] = −2.66, and ξ = 1.7 km s-1.
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