M_UV (from NIRSpec spectra; see Appendix D) versus systemic redshift (based on optical lines) for our sample. Galaxies observed in different tiers are coloured differently. Sources detected in Lyα emission are shown as diamonds with black outlines. Horizontal dashed lines show M_UV values of −18.75 and −20.25, while the vertical grey line shows our lower redshift cutoff (z_sys > 5.6).