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Fig. 7.
Observed (solid) and modeled (dotted) MgII line of QSO B1420+326 in the rest frame at three epochs. The lines on 2020 January 28 (MJD = 58876), February 8 (MJD = 58887), and February 25 (MJD = 58904) are shifted by values of 0.8, 0.3, and 0.1, respectively, for clarity.
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