Comparison of the properties of the four LAE-LGRBs from the golden sample (orange stars) to other LAE-LGRBs and Lyman continuum emitters (LCEs) reported in Verhamme et al. (2017), Izotov et al. (2018a,b), and Fletcher et al. (2019). The white stars with orange contours represent LAE-LGRBs for which information on indirect indicators is available. The color bar codes the f_esc(LyC) of the LCEs. In the four panels the blue rectangle represents the space parameter of low LyC leakage (f_esc(LyC) < 5%), while the red rectangle marks the space parameter of high LyC leakage (f_esc(LyC) > 5%), as defined by Verhamme et al. (2017). Panel a: escape fraction of Lyα photons as a function of the rest-frame Lyα EW. Panel b: correlation between the rest-frame Lyα EW and the [OIII]/[OII] ratio. The distribution of [OIII]/[OII] ratio for the LGRB host galaxies from Krühler et al. (2015) is also superimposed. Panel c: relation between the Lyα red peak velocity shift and the rest-frame Lyα EW. Panel d: correlation between the Lyα red peak velocity shift and the [OIII]/[OII] ratio.