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Fig. 6.


The appearance of the He I-5876 line in emission. Top panel: an example of the appearance of the He I-5876 line at a phase when a double-peaked CCF occurs in RV Tau. Bottom panel: a dynamical plot of all the spectra of RV Tau around the He I-5876 line folded on the fundamental pulsation period of 39.3 days.

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