Relation between the Lyα peak velocity separation () versus 1-C_f(H I). Our sample is represented by black triangles and blue circles for galaxies with unknown and known leakage, respectively. The sample from McKinney et al. (2019) and Jaskot et al. (2019) is shown with orange squares. We note that the latter studies only report C_f(Si II) measurements, from which we derived the corresponding C_f(H I) using the empirical C_f(Si II)-C_f(H I) relation found in Gazagnes et al. (2018).