The energy calibration is performed with y rays of energy up to 9 MeV from the reaction Ni(n, y)Ni, with electrons from muon decays, and with the P decays from spallation products of cosmic-ray-muon interactions. From these calibrations, the absolute energy normalization is known to be better than 3%. The rms energy resolution for an electron is expressed by 22%/[E, /(10
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