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Article Contents
1 Introduction
2 Summary
3 Evaluation of the covariance
4 Vanishing weights
5 Moments expansion
6 Properties
7 Examples
8 Conclusions
Appendix A: Vanishing weights
Appendix B: Moments expansion
Appendix C: Varying weights
Appendix D: Properties of the Laplace transform
References

Copyright ESO 2002
Published by EDP Sciences