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Fig. 6
Hα/Hβ ratio plotted against the BP temperature for f ≤ 10%, where full circles denote TBP < 30 000 K and open circles TBP > 30 000 K, and are separated with the vertical dashed line. The horizontal dashed line represents Hα/Hβ = 3.1. The solid line gives the line ratio calculated using Eq. (1).
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