Comparison of narrow line profiles from the first NOT observation, JD 55 288, showing the narrow component before the development of the extended wings (day 23 after outburst). Note that the central peak in the Na I D absorption line coincided with the peak of the other emission lines, suggesting that this was also a superimposed chromospheric emission component. Top: [Ca II] 7291 Å (solid), [O I] 6300 Å (dash), [Ni II] 6666 Å (dot-dot-dash). Bottom: Na I 5889 Å (solid), 5895 Å (dash) for comparison.
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