Spectra of galaxies at redshifts higher than the reionization epoch. The solid black lines represent unabsorbed templates for a galaxy 70 Myr old, having a metallicity Z = 5 × 10^-2   Z_⊙, which has experienced an instantaneous star-formation, resulting in the production of 10⁶   M_⊙ of stars. Dotted and dashed lines show the effects of different types of reddening, as labeled in the figure. The spectral region blueward of the Lyα is assumed to be completely absorbed by the intervening intergalactic medium.