Fig. 9
Na iλ5895.92 (D1) profiles of RR Lyr for ϕ = 0.227 on the night of 2017-03-26. The Blazhko phase is ψ = 0.44, that is, close to the minimum. The vertical line indicates the sodium line laboratory wavelength in the stellar rest frame. Note that two strong telluric lines are blanketing the center of the D2 component, which is different to the D1 component (Hobbs 1978).
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