Çakır, Orhan2020-02-202020-02-202016063001https://doi.org/10.1088/1674-1137/40/6/063001http://hdl.handle.net/20.500.12575/69912From 2011 to 2014, the BESIII experiment collected about 5 fb-1 data at center-of-mass energies around 4 GeV for the studies of the charmonium-like and higher excited charmonium states. By analyzing the di-muon process e+e- → γISR/FSRμ+μ-, the center-of-mass energies of the data samples are measured with a precision of 0.8 MeV. The center-of-mass energy is found to be stable for most of the time during data taking.enCC0 1.0 UniversalArticle40601091674-1137