Derived median Lyα equivalent width (restframe) versus input Lyα equivalent width for our mock sample of 500 B-drop galaxies. The errorbar indicates the median 68% confidence limit on the derived EW(Lyα); no offset between the derived median and the input value is obtained, which demonstrates that our method works, at least statistically. A small fraction of objects is found at higher EW(Lyα), outside the plot. Good agreement is obtained for all of them.