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*Yoshihiro Kuroiwa
Department of Physical Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan. CREST, Japan Science and Technology Agency, Honmachi, Kawaguchi, Saitama 332-0012, Japan.
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Shinobu Aoyagi
Department of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.
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Eiji Nishibori
Department of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.
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Makoto Sakata
Department of Applied Physics, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.
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Masaki Takata
Japan Synchrotron Research Institute (SPring-8), Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan. CREST, Japan Science and Technology Agency, Honmachi, Kawaguchi, Saitama 332-0012, Japan.