Distribution of R magnitude (top left), EW(Lyα) (top right), rest-frame UV concentration (bottom left), redshift (bottom right) of our sample of 76 sources (empty histograms in the inserts). Filled histograms correspond to the distributions of the 1070 Lyα emitting galaxies at 2 < z < 4. The vertical dashed lines indicate the median value of each histogram. In the top left panel, the dot-dashed vertical lines indicate the median R values of the two bins obtained, separating the sample with respect to the median of the 76-galaxy distribution.