In GraphFitChisquare, when using the effective variance technique, the chisquare must be divided by 2.
In GraphFitChisquare, when using the effective variance technique,
the chisquare must be divided by 2.

Add comments about this technique (thanks Eddy Offermann)


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@9467 27541ba8-7e3a-0410-8455-c3a389f83636

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