Blow-up of selected spectral windows in two spectra of NGC 4490−2011OT1, at first peak (top panels) and during second maximum (bottom panels). The regions at 4750–5350 Å (left panels), 5800–5950 Å (middle panels) and 8300–8800 Å (right panels) are shown. The positions marked in the bottom panels are those of the P Cygni minima, obtained assuming an average expansion velocity of 300 km s⁻¹ (see text). The position of He I λ5876 is also marked, although that feature is not clearly detected.