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Fig. 11
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INT/IDS spectra (gray) of the DOA WD WDJ154843.31+472936.11 (top, overplotted with a pure He model with Teff = 40 kK and log ɡ = 7.5) and the DAO WD WDJ210110.17– 052751.14 (bottom, overplotted with a H+He model with Teff = 48.9 kK, log ɡ = 8.14, and log (He/H) = −0.58.
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