Radial velocity of the prominent emission peak in the profile of He i 6678 Å folded with the 28.9-day period represented by solid symbols: dots Ondřejov, triangles BeSS, square Hanuschik (1987). The open symbols indicate the emission velocities of Hα and Paschen lines: circles Hα Ondřejov, diamonds Paschen Ondřejov, triangles BeSS Hα.
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