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Fig. 5
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He I λ5875.66 line (D3) P Cygni profile of RR Lyr from the night of September 5, 1995 (ψ = 1.60), obtained by coadding two spectra at pulsation phases of 1.017 and 1.085. The second D3 emission is expected to occur within this pulsation phase range. The position of D3 is marked by a vertical line.
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