fix some problems with histograms
fix some problems with histograms

SHornung1/AliPhysics,nschmidtALICE/AliPhysics,adriansev/AliPhysics,fcolamar/AliPhysics,SHornung1/AliPhysics,AMechler/AliPhysics,alisw/AliPhysics,alisw/AliPhysics,pchrista/AliPhysics,adriansev/AliPhysics,adriansev/AliPhysics,mpuccio/AliPhysics,victor-gonzalez/AliPhysics,dmuhlhei/AliPhysics,hzanoli/AliPhysics,hzanoli/AliPhysics,mpuccio/AliPhysics,adriansev/AliPhysics,amaringarcia/AliPhysics,nschmidtALICE/AliPhysics,pchrista/AliPhysics,pchrista/AliPhysics,hzanoli/AliPhysics,dmuhlhei/AliPhysics,victor-gonzalez/AliPhysics,AMechler/AliPhysics,rbailhac/AliPhysics,amaringarcia/AliPhysics,mpuccio/AliPhysics,pchrista/AliPhysics,rbailhac/AliPhysics,rihanphys/AliPhysics,SHornung1/AliPhysics,SHornung1/AliPhysics,lcunquei/AliPhysics,fcolamar/AliPhysics,amaringarcia/AliPhysics,fcolamar/AliPhysics,dmuhlhei/AliPhysics,mpuccio/AliPhysics,victor-gonzalez/AliPhysics,alisw/AliPhysics,rbailhac/AliPhysics,rbailhac/AliPhysics,fcolamar/AliPhysics,adriansev/AliPhysics,rbailhac/AliPhysics,hzanoli/AliPhysics,lcunquei/AliPhysics,SHornung1/AliPhysics,lcunquei/AliPhysics,AMechler/AliPhysics,pchrista/AliPhysics,amaringarcia/AliPhysics,victor-gonzalez/AliPhysics,AMechler/AliPhysics,amaringarcia/AliPhysics,mpuccio/AliPhysics,rihanphys/AliPhysics,fbellini/AliPhysics,fbellini/AliPhysics,hzanoli/AliPhysics,mpuccio/AliPhysics,dmuhlhei/AliPhysics,rihanphys/AliPhysics,dmuhlhei/AliPhysics,rbailhac/AliPhysics,nschmidtALICE/AliPhysics,lcunquei/AliPhysics,amaringarcia/AliPhysics,hzanoli/AliPhysics,amaringarcia/AliPhysics,AMechler/AliPhysics,victor-gonzalez/AliPhysics,hzanoli/AliPhysics,lcunquei/AliPhysics,AMechler/AliPhysics,rihanphys/AliPhysics,fbellini/AliPhysics,dmuhlhei/AliPhysics,alisw/AliPhysics,victor-gonzalez/AliPhysics,fbellini/AliPhysics,rihanphys/AliPhysics,lcunquei/AliPhysics,fcolamar/AliPhysics,alisw/AliPhysics,pchrista/AliPhysics,rihanphys/AliPhysics,SHornung1/AliPhysics,rihanphys/AliPhysics,rbailhac/AliPhysics,fbellini/AliPhysics,nschmidtALICE/AliPhysics,nschmidtALICE/AliPhysics,SHornung1/AliPhysics,alisw/AliPhysics,adriansev/AliPhysics,nschmidtALICE/AliPhysics,fbellini/AliPhysics,mpuccio/AliPhysics,lcunquei/AliPhysics,adriansev/AliPhysics,victor-gonzalez/AliPhysics,AMechler/AliPhysics,fcolamar/AliPhysics,alisw/AliPhysics,fcolamar/AliPhysics,dmuhlhei/AliPhysics,nschmidtALICE/AliPhysics,fbellini/AliPhysics,pchrista/AliPhysics