Sample VUDS spectra in the range 5 < z < 6. When the IGM transmission becomes high, the main spectral features used for the redshift determination are the spectral break produced by the IGM below Lyα and the Lyα line itself. The number of galaxies with Lyα in emission is about equivalent to galaxies with Lyα absorption (see Cassata et al. 2014, for a detailed discussion).
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