Luminosity versus equivalent width for the galaxies in our sample (red points); filled and open circles indicate respectively galaxies with and without a detected continuum. For the latter, the measure of the EW is a lower limit. Black diamonds, triangles, crosses and squares show respectively the samples of Ouchi et al. (2008), Dawson et al. (2007), Murayama et al. (2007) and Saito et al. (2008).
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