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Neutron beam spectra for the ICON and BOA facilities where the experiments were conducted. The spectra are normalized to unit peak intensity. The cold neutron BOA beamline has a waveguide between the source and the sample position, which diverts the beam from the path of high-energy neutrons and γ-rays. Only neutrons with wavelengths above ∼1 Å are present in the beam. The ICON facility has some contribution from epithermal neutrons.
