text: #ifndef CD_Chi2Strip1DEstimator_H_
  #define CD_Chi2Strip1DEstimator_H_
  
  /** \class Chi2Strip1DEstimator
   *  A Chi2 MeasurementEstimator that only uses the X coordinate
   *  in the measurement frame (the one perpendicular to the strip).
   *  Ported from ORCA.
   *
   *  \author todorov, cerati
   */
  
  #include "TrackingTools/KalmanUpdators/interface/Chi2MeasurementEstimatorBase.h"
  
  class Chi2Strip1DEstimator final : public Chi2MeasurementEstimatorBase {
  
  public:
  
    explicit Chi2Strip1DEstimator(double maxChi2, double nSigma = 3.) : 
      Chi2MeasurementEstimatorBase( maxChi2, nSigma) {}
  
    std::pair<bool,double> estimate(const TrajectoryStateOnSurface&,
  				     const TrackingRecHit&) const override;
  
    Chi2Strip1DEstimator* clone() const override {
      return new Chi2Strip1DEstimator(*this);
    }
  
  };
  
  #endif //CD_Chi2Strip1DEstimator_H_
  