Variations of He i 6678 Å line. Upper panel: grey-scale representation. Bottom panel: the typical line profiles are plotted from the spectra taken at the Ondřejov Observatory (R ~ 12 500). The central wavelength is denoted in the laboratory frame λ₀ and in the frame connected with the object. The shift is determined by the system RV rv_sys = 40 ± 4 km s^-1  obtained from the RVs of the [O i] λλ 6300, 6364 Å lines.