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We investigated abundance ratios along the profiles of six high-redshiftDamped Lyman-alpha systems, three of them associated with H2 absorption, andderived optical depths in each velocity pixel. The variations of the pixelabundance ratios were found to be remarkably small and usually smaller than afactor of two within a profile. This result holds even when consideringindependent sub-clumps in the same system. The depletion factor issignificantly enhanced only in those components where H2 is detected. There isa strong correlation between [Fe/S] and [Si/S] abundances ratios, showing thatthe abundance ratio patterns are definitely related to the presence of dust.The depletion pattern is usually close to the one seen in the warm halo gas ofour Galaxy.Comment: 14 page

Relative abundance pattern along the profile of high redshift Damped Lyman-$\vec \alpha$ systems