Fig. C.1
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Top: respective best fits to the MMT (31.2 kK, log g = 6.18, logN(He)/N(H) = −2.8) and Bok (28.9 kK, log g = 5.85, logN(He)/N(H) = −3) spectra of PG0215+183. Bottom: Best fit to the Bok spectrum of PG1519+640, a star with similar atmospheric parameters as PG0215+183 and showing hints of He stratification in its MMT spectrum.
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