Fig. 2
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Composite spectrum of BD +61 487 adjusted in height to the phase of each of the observations, for the He I λ 4471 line. The color is assigned randomly, and the orbital phase of each spectrum—matching the same color—is displayed on the right side. This figure in combination with Fig. A.1 (in Sect. A.1) show the Oe+O nature of the system.
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