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Fig. 9

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Line evolution of the Ca II H line and H ε (top), the H β line (middle), and the He I D3 line (bottom) during the large flare. The observation times for all spectra are given in the middle panel. For comparison, we include the spectrum with the smallest EW(H α) taken at 23-03-2024 and a spectrum of the inactive K3 giant v UMa for each shown line.

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