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Fig. 2


He ii 1640 Å line in the HST/STIS spectrum (thin gray line). Overplotted are three models (thick lines) with different Teff  (dashed, solid, and dotted, as indicated in the legend) and log  g = 6.7. Observation and model were convolved with a 0.02 Å boxcar and a 0.036 Å Gaussian, respectively.

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