R value measurements for annihilation at 2.60, 3.07 and 3.65 GeV
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Current address: Zhengzhou University, Zhengzhou 450001, People's Republic of China.
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Current address: Johns Hopkins University, Baltimore, MD 21218, USA.
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Current address: University of Oklahoma, Norman, OK 73019, USA.
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Current address: Jinan University, Jinan 250022, People's Republic of China.
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Current address: National Natural Science Foundation of China, Beijing 100085, People's Republic of China.
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Current address: University of Hong Kong, Pok Fu Lam Road, Hong Kong.
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Current address: Graduate University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
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Current address: Cornell University, Ithaca, NY 14853, USA.
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