Comparison of the correlation lengths as a function of redshift. The filled triangles with error bars are VVDS-Deep measurements while the dashed curve and associated shaded area correspond to the correlation length and error from the Omocks. We also report in this figure the previous VVDS-Deep measurements by Le Fèvre et al. (2005b) (crosses) and the one obtained by Coil et al. (2004) in the DEEP2 survey (open square).