tokens: This work has been financially supported by the Centre National d’Études Spatiales (CNES), the Institut National des Sciences de l'Univers (INSU), Airbus Group, Thales Alenia Space and the Région Limousin. We gratefully acknowledge Wolfgang Sohler for many helpful and stimulating discussions. Our thanks go also to A. Dexet for the development and his advices for all the specific mechanical components.
ner_tags: O O O O O O O O B-Organization I-Organization I-Organization I-Organization B-Organization O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization B-Organization B-Organization I-Organization B-Organization I-Organization I-Organization O O B-Organization I-Organization O O O B-Person I-Person O O O O O O O O O O O B-Person I-Person O O O O O O O O O O O O