Int_t GetNTracksMatched() const { if (fTracksMatched) return fTracksMatched->GetSize();
else return -1;}
UInt_t GetNLabels() const { if (fLabels) return fLabels->GetSize();
- else return -1;}
+ else return (0);}
void GetMomentum(TLorentzVector& p, Double_t * vertexPosition );