Fig. 6
Optical spectra of U Sco during the SSS phase. The time since maximum is marked against the spectrum. Note the general decrease in the emission line strengths. For clarity, the zero level of the spectra of days 20.822, 21.812, 22.182 and 23.805 are offset, respectively, by a constant value of 1.5, 1.1, 0.8 and 0.5 in flux units.
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