Comparison between the intrinsic (unattenuated) EW of Hα and the UV β slope, color-coded by [OIII]+Hβ EW. Lyα galaxies are shown with star-shaped markers, and the photometric sample as circles. Galaxies shown in gray do not have [OIII]+Hβ EW measurements. We show the region predicted by Zackrisson et al. (2017) to show f_esc > 0.5. We rescale from Hβ EW to intrinsic Hα with a case B recombination scenario of factor 2.89, assuming a flat optical continuum in f_λ, which we confirm from the SED fitting done in Sect. 3.1.