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The engineering Test Satellite VI (ETS-VI) is a three-axis-stabilized satellite launched by NASDA in 1994. On-orbit experiments, which consist of identification and attitude-control experiments, were planned as one of the ETS-VI on-board experimental programs, and were carried out in 1995. This experimental program was called 'FLEX' (Flexible EXperiments). The purpose of FLEX was to establish fundamental...