Relations between ξ_Lyα, the “relative Petrosian extension of Lyα” as defined in Hayes et al. (2013), and global kinematical parameters v_shear, σ₀ and v_shear/σ₀ with symbols according to the legend in Fig. 9. For galaxies with no Lyα emission (LARS 4 and LARS 6, circled symbols) ξ_Lyα is defined as zero and for LARS 9 the measured ξ_Lyα presents a lower limit (see also Hayes et al. 2013). Spearman rank correlation coefficients ρ_s and corresponding p₀ values are calculated excluding LARS 4 and LARS 6.