Fig. 10.
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Evolution of the strength factors with respect to the orbital phase. Top: for Hα λ6562 (circles) and He II λ4686 (crosses), for the stellar atmosphere component. The dashed red curve shows the best fit from the Fourier analysis. Bottom: for He I λ6678, for the stellar atmosphere component. The horizontal dashed red curve shows the mean value of the strength factors.
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