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Hi all, here I show the stat power (BRBR/errBRBR) as a function of the cuts on mm2 (low cut and high cut) running on cocktail MC (selection phot 6) qtot=0 http://www.slac.stanford.edu/~daniele/vub/resq0.ps qtot=-1,0,1 http://www.slac.stanford.edu/~daniele/vub/resq1.ps Optimal points are in qtot=0 mm2low=-0.6 Gev^2, mm2high=0.3 GeV^2 (-10% with respect to the usual range -inf - .5) qtot=-1,0,1 mm2low=-0.6 Gev^2, mm2high=0.4 GeV^2 In general qtot=0 has an error ~15%-20% lower than the one using qtot=-1,0,1 Daniele