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Fig. 2.

image

Best fit (black curve) to the Balmer and helium lines visible in our low-resolution spectrum with high S/N (red curve) of Feige 46. We used a three-dimensional grid (Teff, log g, N(He)/N(H)) of NLTE model atmospheres, including a fixed metallic composition (solar N, S, and Fe, 1/10 solar C, O, and Si) that is typical for sdB stars.

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