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tokens: The authors are grateful to an anonymous referee for a careful reading of the manuscript and several stimulating comments that helped to improve this work. A.F.L. and S.M. are grateful to Drs. J. Bouvier, A. Frasca, A. Klutsch, A. C. Lanzafame, and E. Moraux for interesting discussions. The authors acknowledge support through the PRIN-INAF 2012 funding scheme of the National Institute for Astrophysics (INAF) of the Italian Ministry of Education, University and Research. This work is based on data obtained by the CoRoT Space Experiment and made available through the CoRoT Archive at the IAS Operation Center whose availability is gratefully acknowledged. CoRoT is a space mission of the French Space Agency CNES in association with French CNRS Laboratories and participation of Austria, Belgium, Brazil, Germany, Spain, and the European Space Agency.