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Hi, after discussing with Jan Erik Sundermann he also made comparisons. He did compare SP5 with SP6 as well as Run1-3 with Run4 and also between data and MC. These plots are very interesting and can be found in: http://www.slac.stanford.edu/~jsunderm/HadMomAnalysis/DataMcComparison/datamccompa rison.html I put Jan Erik in Cc in case somebody has questions. It looks like that he also observes on MC large differences between SP5 and SP6. However, on data, Run1-3 and Run4 seem to be in better agreement. Please keep in mind that he is applying Michael Mazur's track and neutral selection which is an improved version on top of what has been done in BAD633. As a reminder, the plots made by Kerstin as a comparison can be found in: http://costard.lbl.gov/~kerstin/vubunf/kinfitter/resolution.html It looks like that there is something to understand in more detail. Cheers, Heiko