Lyα (top panels) and Lyman continuum (lower panels) escape fractions with Si ii outflow properties. The left column shows the effect of the Si iiv_cen on the escape fractions. The middle column shows the effect of the v₉₀/v_cen ratio (a measure of the shape of the line profile) on the respective escape fractions. Finally, the right column shows the effect of the Si ii equivalent width on the Lyα peak separation (upper right panel) and the LyC escape fraction (upper left panel). Both the peak separation and are related to the H i column density. The point shapes correspond to their respective samples, as shown in the legend.