The dynamic spectra calculated using the disordered supercell (DCI32) correlates best with experiment. While there are some differences between the two MD calculations above 100 cm -1 which could be argued improve correlation with experiment it is the large differences below 100 cm -1 that seem to be key. In particular, there is now a broad feature in the calculated spectra that stretches from 40 cm -1 upwards that seems to correlate with experiment, at least in terms of peak position if not in terms of relative intensity of the many modes involved.