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Fig. 1
Three examples of Hα profiles. The upper spectrum is taken from the time of maximal EW = 18.2 Å (19 960 825). The middle spectrum has a EW = 13.1 Å (2 000 917). The lower spectrum (20 120 707, EW = 10.8) is taken at a moment when the star fulfilled the shell criterion (see also Sect. 5.3).
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