Fig. 9
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Upper panel: best fit of the Balmer and helium lines in selected stars from the MMT sample. Top: BD+48°2721, a known 3He star, and PG0004+133. The mismatch between the predicted and observed He lines is due to the stratification of helium in the atmosphere. Bottom: PG1710+490, a known 3He star with no indication of stratification (also according to Schneider et al. 2018) and PG1604+504, that shows no indication of stratification.
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