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Results on Lambda, Anti-lambda, and Xi- production in centrality selectedPb+Pb reactions at 40A and 158A GeV and in near-central C+C and Si+Si reactionsat 158A GeV are presented. Transverse mass spectra, rapidity spectra, andmultiplicities in dependence of the system size are discussed. Comparisons totransport models (UrQMD2.3 and HSD) and to the core-corona approach areperformed. While Lambda and Anti-lambda production can be described bytransport models reasonably well, these models do not agree with the Xi-measurements. On the other hand, the core-corona picture fits very well thesystem-size dependence of Lambda and Xi-, while it agrees less well with theAnti-lambda data.

System-size dependence of Lambda and Xi production in nucleus--nucleus collisions at 40A and 158A GeV measured at the CERN Super Proton Synchrotron