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Fig. 1.
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Optical spectra of 5BZQ J1243+4043 from: the NOT spectrum #1 (MJD 56035.11; Titov et al. 2013) shown in blue, the LAMOST spectrum #2 (MJD 56360.75; Peña-Herazo et al. 2021a) in orange, and a new GTC spectrum #3 acquired in this work (MJD 60318.21) in green. The shaded areas indicate the corresponding flux uncertainties.
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