Second (up), first (middle), and third (down) apparitions of the emission that occurred in the large photospheric absorption profile of Hα during the night of August 31, 1997. The fitting of the spectrum makes it possible to highlight the two smallest emissions. The Blazhko phase, ψ, and the pulsation phase, φ, are given in the left upper corner. The laboratory wavelength is marked by a vertical line.