Lyα and [OIII]λ5007 emission lines from the X-shooter spectra of the four GRB host galaxies GRB 011211, 021004, 060926, and 070110 from top to bottom. The lines are centered at the systemic redshift of the galaxy determined from the [OIII] emissions lines. The flux density F_λ is in units of 10⁻¹⁷ erg s⁻¹ cm⁻² Å⁻¹. Bottom panel: superposition of the four Lyα lines rebinned to 0.8 Å and normalized to the Lyα line flux.