6 Acknowledgements

The author thanks Jean-Pierre Wuelser, Nariaki Nitta, Jim Lemen, and Anne Sandman from the SECCHI/EUVI team for constructive discussions and support. We acknowledge also constructive and helpful comments by two anonymous referees that helped to improve the paper. This research has made extensive use of NASA’s Astrophysics Data System (ADS) Bibliographic Services. This work is supported by the NASA STEREO under NRL contract N00173-02-C-2035. The STEREO/ SECCHI data used here are produced by an international consortium of the Naval Research Laboratory (USA), Lockheed Martin Solar and Astrophysics Lab (USA), NASA Goddard Space Flight Center (USA), Rutherford Appleton Laboratory (UK), University of Birmingham (UK), Max-Planck-Institut für Sonnensystemforschung (Germany), Centre Spatiale de Liège (Belgium), Institut d’Optique Théorique et Applique (France), and Institute d’Astrophysique Spatiale (France). The USA institutions were funded by NASA; the UK institutions by the Science & Technology Facility Council (which used to be the Particle Physics and Astronomy Research Council, PPARC); the German institutions by Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR); the Belgian institutions by Belgian Science Policy Office; the French institutions by Centre National d’Etudes Spatiales (CNES), and the Centre National de la Recherche Scientifique (CNRS). The NRL effort was also supported by the USAF Space Test Program and the Office of Naval Research.

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