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Hi, this is a question concerning the evaluation of the systematic error coming from the variation of the m_ES fit parameters (mean, sigma, alpha, argar) within their errors. How has this been done exactly? - Has this been done for data and MC? - If yes, has it been done independently for all four sets (data, vub MC, vcb MC, oth MC) and for all fit parameters? - Which error was taken for the variation of the parameters? Thanks, Kerstin