Comparison between the [[O III]λ5007] line emission of the D1 (solid blue) and T1 (solid red) regions (extracted from the spectra presented in Fig. 2) and the Lyα flux observed at the same position (from VLT/MUSE; see Vanzella et al. 2019, 2021), rescaled by a factor 0.5 in order to ease the comparison of the peak relative velocities. For both regions, the center of the [O III]λ5007 line has been used as the systemic redshift and therefore as reference for the x-axis. The Lyα line peaks at Δv ∼ +100 km s⁻¹ in both regions.