Ok, I found the time when the left and right signals of ZDC CFD are flipped back to the right values. It is sometime between run 4610 and 4640. Although I am not sure the precise run number, it is not a problem since there are no data runs after the run 4612, which is continued midnight run from 4640, and run 4640. Whoever writting and/or using ZDC CFD vertex, just be aware!!! Hiro
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