This is the output ntuple. If you know me, you'll know that the less I say about ntuples (and the programs that use them), the better. I'll just point out that for the default ntuples, we try to use the same naming conventions, coordinate systems, units, and formula as we use in the engine. Of course in the end, everyone does their physics calculations slightly differently, so you'll have to check that your data and SIMC reconstruction is done exactly the same way.