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Hi all, I recalculated the binning systematics. Changing dramatically the binning (same set of bins I used before) I got these results: testbin1 BRBR = 0.0205788 +- 0.00250994(stat) (default) testbin2 BRBR = 0.0207638 +- 0.00272592(stat) testbin3 BRBR = 0.0208178 +- 0.00299869(stat) testbin5 BRBR = 0.0207926 +- 0.00252402(stat) testbin6 BRBR = 0.0206812 +- 0.00251464(stat) testbin7 BRBR = 0.0206974 +- 0.00253821(stat) testbin8 BRBR = 0.0207684 +- 0.0025026(stat) testbin9 BRBR = 0.0206784 +- 0.00250905(stat) testbin10 BRBR = 0.020698 +- 0.00251046(stat) testbin11 BRBR = 0.0205928 +- 0.00265818(stat) and the correspondent binning is shown in the plots in Taking the maximum shift as systematics I get 1.2% Before was 2.9%. I am not completely sure about the difference, I think that the 2.9% was calculated with the old MC statistics and without the signal res-nonres reweighting. Daniele