text: import FWCore.ParameterSet.Config as cms
  
  import TrackingTools.MaterialEffects.MaterialPropagator_cfi
  #PropagatorWithMaterialESProducer 
  alongMomElePropagator = TrackingTools.MaterialEffects.MaterialPropagator_cfi.MaterialPropagator.clone()
  alongMomElePropagator.Mass = 0.000511
  alongMomElePropagator.ComponentName = 'alongMomElePropagator'
  
  