Temporal evolution of the spectral line profiles centered at the rest-frame wavelengths of Na Iλ5890, 5896, [O I] λ6300, [O I] λ6364, Hα, [Ca II] λ7291, and [Ca II] λ7323, as labeled in each subpanel. All spectra are presented in velocity space. Three vertical dashed black lines mark the rest-frame velocities of −1500, 0, and +1500 km s⁻¹. The dotted blue lines mark the [N II] λλ6548, 6583 and [S II] λλ6716, 6731 emission lines from an H II region in the host galaxy.