Lyman-α peak separation against Lyman-α escape fraction, color-coded by the LyC escape fraction. We also show observational data from Yang et al. (2017) in the orange triangles and Flury et al. (2022b) in the blue squares. Here, we are showing that although spectra with large peak separations (above 300 km s⁻¹) always have low LyC and Lyman-α escape fractions, the contrary is not true, as we have many lines of sight with both low peak separation and escape fractions.