Fig. 3

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Fits to He II 4686 Å, Hβ, and Hα observed in the X-shooter spectra of a selection of our O(H), sdO, and DAO WD stars. Over plotted in red are the best fit TMAP models. The spectral classifications, names of the stars, the derived effective temperatures, surface gravities, and logarithmic He/H ratios (by number) are indicated. The Balmer line problem is more or less evident in each star.
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