Observed profiles of the Hα line for X Cygni between July 1989 and September 1992 at the 1.52 m telescope of the Observatoire de Haute-Provence. The pulsation phase ϕ is denoted in the upper corner of each spectrum where the wavelength is given in Å in the stellar rest frame and the small vertical lines give the position of the laboratory wavelength of Hα. The spectrograph AURELIE at a resolving power R = 60 000 was used. This figure was produced by M.G. Breitfellner during his thesis work (Breitfellner 1993).