Simulated Lyα spectra for various random motions of the H I bipolar wind (σ_ran = 12.8, 100, and 200 km s⁻¹) at θ_o, Wind = 60° and θ_LOS = 0°. The intrinsic line width σ_Src is fixed at 100 km s⁻¹, based on the shell model in Iani et al. (2021). The black and gray dashed lines represent the observed spectrum and the shell model spectrum, respectively. The orange line corresponds to the spectrum at θ_o, Wind = 60° from Fig. 4. The navy and violet lines are spectra for σ_ran = 100 and 200 km s⁻¹, respectively. Higher random motion induces redshifting and deviation from the observed spectrum. The simulated spectra are normalized by setting the same peak height as the spectrum of the previous fit with the shell model.