Velocity filling factor in this study compared to Parsons et al. (2024). This figure shows a comparison between the velocity filling factor we derived here, and the velocity filling factor from Parsons et al. (2024). We compute the velocity filling factor from optical depths of the red and blue absorption dips obtained by Parsons et al. (2024) using equation 23 from Sundqvist et al. (2014). When the ratio of the red and blue absorption dips reached values above 2 we excluded it here as this results in non-physical f_vel.