Fix bug when plotting chamber efficiency
Fix bug when plotting chamber efficiency

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liPhysics,amatyja/AliPhysics,akubera/AliPhysics,hzanoli/AliPhysics,hcab14/AliPhysics,lfeldkam/AliPhysics,dstocco/AliPhysics,yowatana/AliPhysics,pchrista/AliPhysics,pbuehler/AliPhysics,mazimm/AliPhysics,SHornung1/AliPhysics,yowatana/AliPhysics,ppribeli/AliPhysics,aaniin/AliPhysics,alisw/AliPhysics,carstooon/AliPhysics,AudreyFrancisco/AliPhysics,btrzecia/AliPhysics,SHornung1/AliPhysics,dlodato/AliPhysics,jmargutt/AliPhysics,hzanoli/AliPhysics,kreisl/AliPhysics,mkrzewic/AliPhysics,pbatzing/AliPhysics,carstooon/AliPhysics,alisw/AliPhysics,pchrista/AliPhysics,dlodato/AliPhysics,jmargutt/AliPhysics,hzanoli/AliPhysics,btrzecia/AliPhysics,mbjadhav/AliPhysics,rderradi/AliPhysics,jgronefe/AliPhysics,preghenella/AliPhysics,adriansev/AliPhysics,mbjadhav/AliPhysics,btrzecia/AliPhysics,ALICEHLT/AliPhysics