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                                 Abstract:Using the BES data collected at √S=4.03GeV.the QED processes of e+e-→e+e-,μ+μ- have been studied. Our measurements agree with the QED prediction,and luminosities obtained from these two final states are compatible at a level of 4%.The total integrated luminosity of 23.1pb-1 was given for all data collected at this energy region from the calculation.
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