Dear Michael and Adrei, The vertex utility class used for the multiplicity analysis selects a vertex in the order: tpm1, bb, zdc. At the moment this class uses the cfd zdc vertex since before the recent slewing corrections that was found to give the better results. Now I presumably want to use the slewing corrected vertex for runs where the slewing correction has been done, and the cfd vertex otherwise. My problem is I don't know from the BrZdcRdo module whether or not a slewing correction was done. Would it be possible to pass the slewing flag to the Rdo module? Or is there a better way to determine if I want to do a GetZ() rather than a GetZCfd(). Regards, Steve
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