yep, there is one ghost per ntuple ciao ric ______________________________________________________ Riccardo Faccini U.C. San Diego, Universita' "La Sapienza" & I.N.F.N. Roma tel +39/06/49914338 http://www.slac.stanford.edu/~rfaccini Univ. La Sapienza. 2,Ple Aldo Moro, I-00100 Roma Dipartimento di Fisica "A voice said to me: 'smile and be happy, things could be worse'. I smiled and was happy and indeed things got worse" (an office in Ferrara) On Mon, 19 Nov 2001, Urs Langenegger wrote: > > Hoi Alessio, > > is this not a feature of the 'ghost'? As I (mis)understand it, the > ntuple structure should be the same for every event, and when one runs > on (say) B0, there ain't no B+, and hence a ghost is created, so that > the associated variables are present. > > Somebody please correct if this is wrong. > > Cheers, > --U >