We thank G. Reverdin and C. Frankignoul for many fruitful discussions and comments on the manuscript. Comments by reviewers provided interesting suggestions and were helpful in improving the manuscript. Support from the European Union (EU Grant EVK2-CT-1999-00020, PREDICATE), is also gratefully acknowledged. Computations have been done at the Institut du Développement et des Ressources en Informatique Scientifique.
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