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Fig. 4.
Time evolution of the spectral changes of the Si II 6347 and 6371 Å, Fe II 6677 Å, and He I 6678 Å. Blue dots denote data from the higher-resolution Elodie, Feros, and DAO spectra, circles, the red ones those from OND spectra, and the green ones those from the BeSS amateur spectra.
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