Gaussian decomposition of the [O I]λλ6300, 6364 and Hα line profiles in the spectrum of SN 2024ggi at 287 days. Panel (a): Three-Gaussian fitting of the [O I] doublet, with a wide component centered nearly at the rest wavelength (i.e., 6300 Å). Panel (b): Four-Gaussian fitting of the [O I] doublet with the separation of the two wide emissions fixed at 64 Å. Panel (c): Three-Gaussian fitting of the Hα line, resulting in a wide component centered at rest. In Table 1, all FWHM and peak velocity values are detailed for the three fittings.