Optical/NIR discovery spectra around the observed Lyα emission line of the new sources presented in this work. Spectra have been normalised to the corresponding z-band magnitude corrected for Galactic absorption. The significant drop at wavelengths shorter than the Lyα confirms the high-redshift nature of all the three objects. The dashed line in each panel shows the composite spectrum derived by Bañados et al. (2016) at the best-fit redshift of each source. The shaded regions show a variation of the Lyα wavelength corresponding to σ_z ± 0.05.