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The use of general descriptive names, registered names, trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Cover illustration: Image of the model of the TET-satellite, taken in the framework of an R&D project, Ref. No 50 RV 0801, implemented on behalf of the Federal Ministry of Economics and Technology.