Lyα escape fraction, $f_{\text{esc}}^{\text{Ly}\alpha }$ vs. Lyα equivalent width, EW_Lyα for the in Sect. 4 analysed subsample of 33 galaxies as in Fig. 12. Both quantities are highly correlated (τ = 0.453/p_τ ∼ 10⁻³), even in a linear sense (Pearson’s r = 0.78/p_r ≃ 10⁻⁷). The dotted line shows the linear fit to the whole sample from M23. Points are coloured according to ${\sigma }_0^{\text{obs}}$ as indicated by the colour bar on the right. Symbols are the same as in Fig. 12, but here we highlight by blue outlines the objects outside of the EW_Lyα and E(B − V)≤0.4 zone in Fig. 12.