I see that variable "aliases" have been introduced into TTree recently (30 June patch). While I have not yet used them, they sounds strikingly similar to what I have been doing via TTreeFormulas for quite some time now. I am curious as to the differences between these aliases and TTreeFormulas. One thing I can see immediately is that the aliases can be persistent (wonderful!). Are there other differences? Are aliases parsed more quickly? Thanks, -Gene
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