Left: rest-frame mean “coadded” VUDS spectra of all spectral members of Cl J0227-0421 with log (ℳ_s) > 9 plotted against that of the field galaxy sample. All type-1 AGN hosts are removed from both samples. Important spectral features are noted. The two spectra exhibit remarkably similar properties. Subtle differences do exist; the average protocluster galaxy appears to have slightly stronger emission features (Lyα, HeII, and CIII]) and a steeper rest-frame NUV continuum slope. Right: median “coadded” VUDS spectra of the same two samples shown in the left panel. The major difference between the median spectra and the mean spectra plotted in the left panel is the enormous decrease in the strength of the Lyα line, which is a reflection of the fact that most galaxies do not emit Lyα at these redshifts. In the median spectrum, the Lyα emission is roughly equivalent amongst the field galaxies and the protocluster members, owing to the similar fractional contribution of LAEs to both samples (see text). The differences in the median and mean spectra suggest that, though the galaxies in the protocluster emit Lyα roughly as frequently as the general field population, those galaxies which do emit Lyα in the protocluster are doing so more profusely.