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Hoi, pion->electron misid is not defined for arbitrary tracks (I don't know of anybody who has actually looked at that number). It is only defined for GTL. If you apply the track cuts that are required for electrons, you'll see the misid rate drop to the permille level. At least I do. In http://www.slac.stanford.edu/~ursl/gtl.eps http://www.slac.stanford.edu/~ursl/ct.eps you see the true-pion-as-electron (left) and the true-pion (right) momentum distributions on the top, and the misid rate at the bottom for GTL selection and for CT selection. While the misid rate is not yet at the 0.5% level, it is far from the numbers Oliver and Henning claim. I guess the continuing part of this story is to figure out what happens with those tracks that are not GTL. Applying the PIDtables on the ntuple level without track cuts is entirely consistent with the Beta-level Pidkilling, i.e. when you apply track cuts you will see the low misid rate and when you don't you'll get the high misid. We see marginal changes (<1%) when applying PidKilling on the ntuple level with an implementation completely different from the Beta level PidKilling. Just my two cents, your mileage will vary. Cheers, --U.