Lyα emission in LGRB host galaxies. Top panel: Lyα fluxes of LAE-LGRBs as a function of redshift. We report the fluxes retrieved from the literature or determined in this paper (see the tables in Appendix A). For the TOUGH and XHG samples, we also plot the upper limits of the host galaxies without detected Lyα emission (empty symbols). Bottom panel: Lyα luminosity of the LAE-LGRBs as a function of rest-frame Lyα equivalent width (EW₀(Lyα)). The sample and symbols are the same as in the top panel.