Fig. 1
Comparison of the three apparitions of Hα line profile of RR Lyr. Panel a: second apparition at φ = 0.74 represented with a spectrum dated on April 10, 2017. Panel b: first apparition at φ = 0.91 represented with a spectrum dated on April 09, 2017. Panel c: third apparition at φ = 1.25 represented with a spectrum dated on April 08, 2017. Vertical line indicates the Hα line laboratory wavelength.
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