Fig. 6.
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Selected optical spectra taken with the SMARTS/Chiron telescope from 2019 March through 2022 March (see the complete list of spectra in Table A.1). Since 2019 March, Hα has been detected in emission and its flux has increased monotonically (see panel g in Fig. 2). Other lines, such as N[II] 6584 Å, were also missing in 2019 and reappeared in emission afterward.
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