Fig. 7
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Upper panel (a, b): HeI 5876Å + NaI D lines (left) and OI 7774Å (right) in the spectra of UX Ori in the normal state on Sep 5, 2020, V = 9.98 mag (blue) and brightness minimum on Jan. 18, 2021, V = 12.48 mag (red). Lower panel (c, d): The same as in the upper panel but for RR Tau: in the normal state with V = 10.66 mag on Oct. 5, 2019, and in the weak state with V = 13.85 mag on Mar. 15, 2019.
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