Fig. 4
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Line profile variations of, from left to right, [N II] 5754 Å, N III 4640 Å, and He I 7065 Å in the days after the outburst. The He I line shows the response of permitted lines formed by recombination. The profiles were normalized to the flux at −3800 km s−1, displaced by a constant increment, and the spectra are labeled with the day since discovery.
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