 minor fix for taking the error or a weighted mean
 minor fix for taking the error or a weighted mean

nschmidtALICE/AliPhysics,amatyja/AliPhysics,sebaleh/AliPhysics,ppribeli/AliPhysics,pbuehler/AliPhysics,rbailhac/AliPhysics,jgronefe/AliPhysics,aaniin/AliPhysics,mvala/AliPhysics,alisw/AliPhysics,fcolamar/AliPhysics,fbellini/AliPhysics,aaniin/AliPhysics,aaniin/AliPhysics,AMechler/AliPhysics,akubera/AliPhysics,dstocco/AliPhysics,dstocco/AliPhysics,AMechler/AliPhysics,pbuehler/AliPhysics,jmargutt/AliPhysics,ALICEHLT/AliPhysics,fcolamar/AliPhysics,btrzecia/AliPhysics,btrzecia/AliPhysics,fcolamar/AliPhysics,rbailhac/AliPhysics,mazimm/AliPhysics,carstooon/AliPhysics,yowatana/AliPhysics,SHornung1/AliPhysics,kreisl/AliPhysics,mpuccio/AliPhysics,rihanphys/AliPhysics,hcab14/AliPhysics,alisw/AliPhysics,pbuehler/AliPhysics,rbailhac/AliPhysics,ALICEHLT/AliPhysics,jmargutt/AliPhysics,SHornung1/AliPhysics,nschmidtALICE/AliPhysics,mpuccio/AliPhysics,pbatzing/AliPhysics,preghenella/AliPhysics,pbatzing/AliPhysics,carstooon/AliPhysics,pbatzing/AliPhysics,ALICEHLT/AliPhysics,jgronefe/AliPhysics,AMechler/AliPhysics,mpuccio/AliPhysics,aaniin/AliPhysics,rbailhac/AliPhysics,pchrista/AliPhysics,pbuehler/AliPhysics,dlodato/AliPhysics,mazimm/AliPhysics,preghenella/AliPhysics,pbuehler/AliPhysics,jmargutt/AliPhysics,kreisl/AliPhysics,mvala/AliPhysics,pchrista/AliPhysics,ppribeli/AliPhysics,AudreyFrancisco/AliPhysics,adriansev/AliPhysics,rbailhac/AliPhysics,hzanoli/AliPhysics,btrzecia/AliPhysics,dlodato/AliPhysics,rihanphys/AliPhysics,victor-gonzalez/AliPhysics,alisw/AliPhysics,SHornung1/AliPhysics,jmargutt/AliPhysics,mvala/AliPhysics,btrzecia/AliPhysics,amatyja/AliPhysics,fbellini/AliPhysics,pchrista/AliPhysics,sebaleh/AliPhysics,preghenella/AliPhysics,victor-gonzalez/AliPhysics,yowatana/AliPhysics,lfeldkam/AliPhysics,preghenella/AliPhysics,hcab14/AliPhysics,mvala/AliPhysics,dmuhlhei/AliPhysics,fcolamar/AliPhysics,sebaleh/AliPhysics,mpuccio/AliPhysics,preghenella/AliPhysics,rihanphys/AliPhysics,alisw/AliPhysics,lcunquei/AliPhysics,SHornung1/AliPhysics,pchrista/AliPhysics,nschmidtALICE/AliPhysics,mazimm/AliPhysics,mazimm/AliPhysics,dmuhlhei/AliPhysics,rbailhac/AliPhysics,mbjadhav/AliPhysics,rderradi/AliPhysics,ppribeli/AliPhysics,amatyja/AliPhysics,mkrzewic/AliPhysics,mvala/AliPhysics,nschmidtALICE/AliPhysics,mkrzewic/AliPhysics,lfeldkam/AliPhysics,rihanphys/AliPhysics,jmargutt/AliPhysics,rderradi/AliPhysics,hzanoli/AliPhysics,hzanoli/AliPhysics,fbellini/AliPhysics,sebaleh/AliPhysics,fbellini/AliPhysics,AMechler/AliPhysics,amaringarcia/AliPhysics,mbjadhav/AliPhysics,yowatana/AliPhysics,victor-gonzalez/AliPhysics,rihanphys/AliPhysics,alisw/AliPhysics,nschmidtALICE/AliPhysics,dmuhlhei/AliPhysics,fbellini/AliPhysics,dstocco/AliPhysics,amaringarcia/AliPhysics,dstocco/AliPhysics,pbatzing/AliPhysics,mpuccio/AliPhysics,btrzecia/AliPhysics,akubera/AliPhysics,carstooon/AliPhysics,kreisl/AliPhysics,mpuccio/AliPhysics,aaniin/AliPhysics,amatyja/AliPhysics,hcab14/AliPhysics,pbuehler/AliPhysics,kreisl/AliPhysics,rderradi/AliPhysics,AudreyFrancisco/AliPhysics,dstocco/AliPhysics,jmargutt/AliPhysics,adriansev/AliPhysics,victor-gonzalez/AliPhysics,ALICEHLT/AliPhysics,lfeldkam/AliPhysics,mbjadhav/AliPhysics,hcab14/AliPhysics,ppribeli/AliPhysics,yowatana/AliPhysics,fbellini/AliPhysics,adriansev/AliPhysics,dmuhlhei/AliPhysics,mkrzewic/AliPhysics,rderradi/AliPhysics,sebaleh/AliPhysics,dmuhlhei/AliPhysics,rihanphys/AliPhysics,jgronefe/AliPhysics,ppribeli/AliPhysics,adriansev/AliPhysics,yowatana/AliPhysics,rderradi/AliPhysics,AudreyFrancisco/AliPhysics,preghenella/AliPhysics,pchrista/AliPhysics,ppribeli/AliPhysics,pbatzing/AliPhysics,carstooon/AliPhysics,dlodato/AliPhysics,mbjadhav/AliPhysics,jgronefe/AliPhysics,lfeldkam/AliPhysics,btrzecia/AliPhysics,akubera/AliPhysics,SHornung1/AliPhysics,dlodato/AliPhysics,pbatzing/AliPhysics,aaniin/AliPhysics,mbjadhav/AliPhysics,ALICEHLT/AliPhysics,nschmidtALICE/AliPhysics,mpuccio/AliPhysics,akubera/AliPhysics,mvala/AliPhysics,dstocco/AliPhysics,dlodato/AliPhysics,ppribeli/AliPhysics,hcab14/AliPhysics,victor-gonzalez/AliPhysics,dstocco/AliPhysics,hzanoli/AliPhysics,fcolamar/AliPhysics,adriansev/AliPhysics,rderradi/AliPhysics,mazimm/AliPhysics,carstooon/AliPhysics,carstooon/AliPhysics,mkrzewic/AliPhysics,SHornung1/AliPhysics,amaringarcia/AliPhysics,victor-gonzalez/AliPhysics,jgronefe/AliPhysics,adriansev/AliPhysics,yowatana/AliPhysics,victor-gonzalez/AliPhysics,AMechler/AliPhysics,amatyja/AliPhysics,mazimm/AliPhysics,amaringarcia/AliPhysics,dmuhlhei/AliPhysics,ALICEHLT/AliPhysics,mkrzewic/AliPhysics,AMechler/AliPhysics,kreisl/AliPhysics,btrzecia/AliPhysics,mvala/AliPhysics,fcolamar/AliPhysics,pchrista/AliPhysics,lfeldkam/AliPhysics,adriansev/AliPhysics,lcunquei/AliPhysics,alisw/AliPhysics,mkrzewic/AliPhysics,akubera/AliPhysics,dmuhlhei/AliPhysics,sebaleh/AliPhysics,fcolamar/AliPhysics,nschmidtALICE/AliPhysics,hzanoli/AliPhysics,amatyja/AliPhysics,lfeldkam/AliPhysics,AMechler/AliPhysics,akubera/AliPhysics,SHornung1/AliPhysics,AudreyFrancisco/AliPhysics,AudreyFrancisco/AliPhysics,mazimm/AliPhysics,dlodato/AliPhysics,mbjadhav/AliPhysics,fbellini/AliPhysics,ALICEHLT/AliPhysics,hcab14/AliPhysics,kreisl/AliPhysics,amaringarcia/AliPhysics,kreisl/AliPhysics,akubera/AliPhysics,aaniin/AliPhysics,lcunquei/AliPhysics,lcunquei/AliPhysics,preghenella/AliPhysics,hzanoli/AliPhysics,jgronefe/AliPhysics,jgronefe/AliPhysics,sebaleh/AliPhysics,rderradi/AliPhysics,rihanphys/AliPhysics,pchrista/AliPhysics,mkrzewic/AliPhysics,amaringarcia/AliPhysics,lcunquei/AliPhysics,AudreyFrancisco/AliPhysics,carstooon/AliPhysics,lcunquei/AliPhysics,hzanoli/AliPhysics,hcab14/AliPhysics,pbatzing/AliPhysics,alisw/AliPhysics,yowatana/AliPhysics,jmargutt/AliPhysics,dlodato/AliPhysics,lcunquei/AliPhysics,mbjadhav/AliPhysics,lfeldkam/AliPhysics,pbuehler/AliPhysics,amatyja/AliPhysics,rbailhac/AliPhysics,AudreyFrancisco/AliPhysics,amaringarcia/AliPhysics