return always a central interval for the Poisson error for N=0 (i.e. return an upper error of 1.84 instead of 1.15)
return always a central interval for the Poisson error for N=0
(i.e. return an upper error of 1.84 instead of 1.15)


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@43694 27541ba8-7e3a-0410-8455-c3a389f83636

bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical,bbockelm/root-historical