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Chihiro Yamanaka
Department of Earth and Space Science, Graduate School of Science, Osaka University Machikaneyama 1-1, Toyonaka, Osaka, 560-0043, Japan
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Hiroshi Asahara
Department of Earth and Space Science, Graduate School of Science, Osaka University Machikaneyama 1-1, Toyonaka, Osaka, 560-0043, Japan
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Hiroshi Matsumoto
Department of Earth and Space Science, Graduate School of Science, Osaka University Machikaneyama 1-1, Toyonaka, Osaka, 560-0043, Japan
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Motoji Ikeya
Department of Earth and Space Science, Graduate School of Science, Osaka University Machikaneyama 1-1, Toyonaka, Osaka, 560-0043, Japan