+ void ExtrapOneStepHelix(Double_t charge, Double_t step,
+ Double_t *vect, Double_t *vout) const;
+ void ExtrapOneStepHelix3(Double_t field, Double_t step,
+ Double_t *vect, Double_t *vout) const;
+
+ void ExtrapOneStepRungekutta(Double_t charge, Double_t step,
+ Double_t* vect, Double_t* vout) const;