Fix floating point precision issues (values having 1e-308 instead of 0.0)


git-svn-id: https://root.cern.ch/svn/root/trunk@49260 27541ba8-7e3a-0410-8455-c3a389f83636
Add tooltips


git-svn-id: https://root.cern.ch/svn/root/trunk@49261 27541ba8-7e3a-0410-8455-c3a389f83636