SN 2022lxg He I NIR lines in velocity space and comparison with other Type IIb SNe: SN 2020acat (Medler et al. 2023), SN 2011dh (Ergon et al. 2015), and SN 2008ax (Roming et al. 2009). The spectra are binned to 5 Å for visual purposes and the original spectra are plotted with lighter colours in the background. The vertical grey line shows the central wavelength. Left: He I 1.0830 μm line. The spectra are normalised at ∼20 000 km s⁻¹ red-wards of the central wavelength. Right: He I 2.0581 μm line. The spectra are normalised at ∼35 000 km s⁻¹ red-wards of the central wavelength.