tokens: Acknowledgements The CoRoT space mission, launched on December 27 2006, has been developed and was operated by CNES, with the contribution of Austria, Belgium, Brazil, ESA, Germany, and Spain. T.S. warmly thanks Cyril Georgy and Sylvia Ekström for discussions on the evolutionary tracks and Sébastien Salmon for the discussions on the instability trips. We are also very grateful to the referee, Dr. D. Baade, whose critical reading of the manuscript helped to improve the presentation of our results.
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