where B1 and B2 are temperature-independent background constants for positive and negative energy transfers. S(|E|, T) is proportional to the structure factor which contains both lattice and magnetic contributions. Note that ± energies are related through the e -E/kT term which is the Boltzmann factor. An assumption in this analysis is that the resolution function does not change substantially over the energy range of interest and therefore the measured intensities at ±|E| are related solely by detailed balance.