1. Fraunhofer Institute for High-Speed Dynamics (Ernst-Mach-Institut), Eckerstr. 4, D-79104 Freiburg, Germany
2. QinetiQ Ltd (Space Division), Cody Technology Park, GU14 0LX, Farnborough, United Kingdom
3. European Space Agency ESTEC, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands