Hα profile of RR Lyr for the 1997 to 2017 observations. Pulsation and Blazhko (in bold) phases (right) and observation dates (left) are indicated. The third emission is present at all Blazhko phases despite the different spectral resolutions and S/N. The detector pixel is shown in each spectrum. The vertical line shows the Hα line laboratory wavelength in the stellar rest frame.