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Fig. 5.
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Reduced optical spectra of IRAS 23226-3843 for the years 1997 until 2020. The spectra were calibrated to the same absolute [O III] λ5007 flux of 9.27 × 10−15 erg s−1 cm−2 taken on 2017 May 10, under clear conditions. The three outburst spectra from 2019 are indicated by their observation date.
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