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Fig. 9.
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He II λ4542 (upper), He I λ5876 (mid), and O III λ5592 (lower) lines of 68 Cyg for several epochs to show its variability. The spectra shown are: 110613_M (blue), 110617_M_4 (red), 110619_M (green), 110619_M_2 (orange), and 140607_C (purple).
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