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*Takeshi Nakatsuka
Inst. of Low Temp. Sci., Hokkaido Univ.
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Keiko Ohnishi
Inst. of Low Temp. Sci., Hokkaido Univ.
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Toshihiko Hara
Inst. of Low Temp. Sci., Hokkaido Univ.
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Akihiro Sumida
Inst. of Low Temp. Sci., Hokkaido Univ.
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Daisuke Mitsuishi
Inst. of Low Temp. Sci., Hokkaido Univ.
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Naoyuki Kurita
Frontier Observational Res. Sys. for Global Change
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Shigeru Uemura
Field Sci. Center of North. Bios., Hokkaido Univ.