class Interpolator1DCubicSplineDataBundle implements Interpolator1DDataBundle, Serializable {

  public double[] getSecondDerivatives() {
    if (_secondDerivatives == null) {
      _secondDerivatives = calculateSecondDerivative();
    }
    return _secondDerivatives;
  }

  public  Interpolator1DCubicSplineDataBundle(final Interpolator1DDataBundle underlyingData);
  public  Interpolator1DCubicSplineDataBundle(final Interpolator1DDataBundle underlyingData, final double leftGrad, final double rightGrad);

}