From December 2011 to May 2014, about 5 $
m fb^{-1}$ of data were taken with
the BESIII detector at center-of-mass energies between 3.810 GeV and 4.600 GeV
to study the charmoniumlike states and higher excited charmonium states. The
time integrated luminosity of the collected data sample is measured to a
precision of 1% by analyzing events produced by the large-angle Bhabha
scattering process.
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