Development of the absorption lines in the blue wing of Hβ emission line profile, Y II 4854.87, Ti II 4855.91, and Cr II 4856.86 Å, during the early stages of the outburst. From top to bottom, the sequence is JD 55 286, 55 288, 55 314, and 55 334 (see text and Table 3 for details).
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