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Measurements of charged pion and kaon production are presented in centralityselected Pb+Pb collisions at 40A GeV and 158A GeV beam energy as well as insemi-central C+C and Si+Si interactions at 40A GeV. Transverse mass spectra,rapidity spectra and total yields are determined as a function of centrality.The system-size and centrality dependence of relative strangeness production innucleus-nucleus collisions at 40A GeV and 158A GeV beam energy are derived fromthe data presented here and published data for C+C and Si+Si collisions at 158AGeV beam energy. At both energies a steep increase with centrality is observedfor small systems followed by a weak rise or even saturation for highercentralities. This behavior is compared to calculations using transport models(UrQMD and HSD), a percolation model and the core-corona approach.

System-size and centrality dependence of charged kaon and pion production in nucleus-nucleus collisions at 40A GeV and158A GeV beam energy