Beam energy measurements can be found in the electronic logbook for ISO-REX-HIE

https://op-webtools.web.cern.ch/elogbook/

measurements for all energies were:

E = 4.985 MeV/u. dE (FWHM)= 0.6%

E=4.715 MeV/u, dE(FWHM)=0.6%

E = 4.29 MeV/u dE(FWHM) = 0.5%

E=3.99 MeV/u .Energy spread around 0.5%.

E = 3.61 MeV/u with dE(FWHM) = 0.55%