in the analysis.

We found about 450 U-dropouts in the entire GOODS-South. We then cross correlated this list with the spectroscopic observations available in the area. Spectra of galaxies in the GOODS-South field were obtained by several different observational campaigns: the two largest ones were conducted by ESO, with FORS2 (Vanzella et al. 2006, 2008, 2009) and VIMOS (Popesso et al. 2009). Other redshifts were obtained with the VLT by GMASS (Kurk et al. 2009), by the HST/ACS/G880L grism survey PEARS (Straughn et al. 2008) and the similar GRAPES project (Pirzkal et al. 2004, Malhotra et al. 2005). In total there are 130 U–dropout galaxies with confirmed redshift.\
As in P07 we define $LBG_L$ the Lyman break galaxies that show the Ly$\alpha$ line in emission, regardless of its strength. We measured the equivalent width (EW) of the  line from the 1D spectra, using the IRAF task splot, by marking two continuum points around the line to be measured. The linear continuum is subtracted and the flux is determined by simply summing over the pixels (no fitting of the line profile is performed). The sample of  contains 66 galaxies of which 24 have rest-frame  Equivalent Width $EW>$ 20 Åand, therefore, would 