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Hi Kerstin,

 I found this old posting by me with the explanation of the method we
used

 http://www.slac.stanford.edu/cgi-bin/lwgate/VUB-RECOIL/archives/vub-recoil.200207/Author/article-45.html

 It is done for the data.

 Cheers,

 Daniele

> 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
>