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Fig. 3

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SB2 composite spectrum of ζ Ori Aa+Ab. The panel shows the weak O ii 4943 lines from the secondary and the composite He i 4922 line. The three HEROS and three FEROS spectra are offset in increasing order of time from the bottom up. As a guide, the RV difference between the bottom two spectra is 25.8 km s-1.

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