[N II] 5754 Å variations corroborated by the ARAS data. The ordinate is the day since outburst divided by 10 (for display), with the spectra displaced by time interval to highlight the sampling cadence. The spectra were individually normalized to the flux at +2500 km^−1. The variations of the He 16678 Å singlet are shown for comparison (right). The nebular stage began at around day 230 (see Sect. 4.1).