Fig. 2
Optical spectra of U Sco during days 0.83–3.83 after outburst maximum. The emission line identifications and day since the estimated maximum are marked. Note the changes in the line profile. For clarity, the zero level of the spectra of days 0.831, 1.825 and 2.821 are offset, respectively, by a constant value of 0.8, 0.5 and 0.3 in flux units.
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