5 CkfElectronTrajectoryBuilder = copy.deepcopy(CkfTrajectoryBuilder)
6 CkfElectronTrajectoryBuilder.propagatorAlong =
'fwdElectronPropagator'
7 CkfElectronTrajectoryBuilder.propagatorOpposite =
'bwdElectronPropagator'
8 CkfElectronTrajectoryBuilder.estimator =
'electronChi2'