Selected optical thickness profiles of the fast and main components at the apex (top panels) and lateral part (bottom panels) of the filament eruption, respectively. The time of the profiles are nearly the same as the two-dimensional spectra shown in Figs. 6 and 7. The colored profiles highlight the subcomponents resulting from the Gaussian fitting model, while the solid gray profiles are composite fitting results by combining the multiple subcomponents. It is also shown the peak velocity υ_peak (km s⁻¹) of the composite profiles and the estimated micro-turbulent velocity ξ (km s⁻¹) of each subcomponent (see the text).