Fig. 1
Bottom (black curves): examples of two spectra (#1 and #16) of the He i line at 4713 Å obtained at two different phases of the orbital period. The two binary components are indicated (P and S). Top (red curves): disentangled spectra of the He i line at 4713 Å for the primary and secondary components. All spectra are shifted vertically to allow for a better reading.
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