Fig. 3
Upper: forbidden [O I] emission. Lower: forbidden [S II] emission. The dotted lines indicate the continuum level, and the dashed lines represent the radial velocity of 27 km s−1. The data from the outburst are plotted in various shades of blue, while the quiescence data are shown in orange. The extra lines observed in the 6363 Å spectrum correspond to unrelated Fe I and Fe II lines, and the strong absorption is due to Fe II 6369 Å. The narrow absorption lines are telluric.
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