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NA61/SHINE is a large acceptance fixed target experiment at the CERN SPS which studies final hadronic states in interactions between various particles and nuclei  . The main topic of this contribution are preliminary results for mean negatively charged pion multiplicities π − from central Ar+Sc and Be+Be collisions. The data were taken recently by the NA61/SHINE collaboration for a wide range of beam momenta. Measured rapidity distributions dn dy were extrapolated to unmeasured regions todoi:10.1051/epjconf/201817116006 fatcat:wwltbxmcpjb7djqbe5dpsrunr4