Fig. 7.
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Variation with the He density of the Balmer-β line profile for 2 × 1020 (black line), 3 × 1020 (blue line), and 5 × 1020 cm−3 (red line); the temperature is 8000 K. The Balmer-β line profiles are also compared to the Lorentzian approximation for the He densities 2 × 1020 cm−3 (dashed black line) and 3 × 1020 cm−3 (dashed blue line).
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