Fig. 12
Variations of EW with phase for He Iλ4472 (4465–4490 Å), He Iλ5876 (5875–5900 Å), He IIλ4686 (4670–4720 Å), Hβ (4840–4890 Å), N IIIλλ4634, 4641 (4620–4650 Å), and N V λλ4604, 4620 (4595–4615 Å). Only the red part of the He I lines is integrated to avoid the excessive blue-shifted absorption, which we interpret as line-of-sight absorption by the shock cone.
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