Line profiles of the maximum emission of D3 and Hα at Blazhko phase corresponding to nights August 5, 6, 9, and 10, 1997. For each pair of observation (D3 and Hα), the Blazhko phase ψ, the pulsation phase φ and the intensity of each emission is given with respect to the continuum. The shock velocity is shown in the lower left corner of the right column. The laboratory wavelength is marked by a vertical line. The very narrow “emission” occurring at the wavelength of D3 on August 10, 1997 is probably caused by noise.