Hi, I have added some code into VVF for the ssbar popping reweighting (for systematics). I apply a +-30% reweighting for ssbar popping in the signal side (ignoring more than one ssbar popping per events) in non-resonant vub MC. This corresponds to the flag -ssbar 1 and -ssbar 2 for subVirFit.pl. In principal there is also the code for the +-100% reweighting in resonant MC but, as I found out yesterday, the higher mass states are not used in Dominiques hybrid. The ntuple variable for the number of kaon pairs in the signal side is called GfK. Cheers, Wolfgang ----------------------------------------------------------------------------- Wolfgang Menges Queen Mary, University of London SLAC, MS 35 Mile End Road 2575 Sand Hill Road London, E1 4NS, UK Menlo Park, CA 94025, USA ++44 20 7882 3753 ++1 650 926 8503 [log in to unmask] -----------------------------------------------------------------------------