(a) Velocity profiles of He I 1.083 μm from 9 to 71 d. Lines identified from IW features (FWHM ∼ 1000 km s⁻¹) are marked with black dotted vertical lines. The inset at the bottom right corner shows narrow (FWHM ∼ 100 km s⁻¹) features at 47, 67, and 71 d, near the zero velocity of He I 1.083 μm. Black boxes connected via black dashed lines indicate the velocity of absorption troughs of broad P Cygni profiles. (b) Velocity profiles of Pa β 1.282 μm and Br γ 2.166 μm from selected epochs. The Pa β line shows an IW feature at 9 d, and the Br γ line shows IW features at 17 and 39 d. See Table 2 for the FWHMs and the shifts from zero velocity of the IW and narrow lines under the columns labeled “Narrow line.” Table 2 also show the velocity shifts of broad absorption, and the velocity interval between minimum and maximum of P Cygni profile.