Gain Notes for Revolution 723 JEM-X1: A quite normal revolution with fine gain fitting. All the data from this revolution should be useable. The Xe analysis confirms that the energy determination for this revolution is okay, within about 3% of the ideal. However, the general level of the Xe line appears to be quite low. This may have to do with the fact that the gain of the instrument is currently very high and this puts the Xe peak on a sharp falloff at high energy that surpresses the peak on its high side and hence pushes the position of the peak to lower energies. If this is the case, no correction for this low Xe line needs to be performed since all the lower energy photons will still have been corrected to their proper value. JEM-X2: No scientific data or gain history data for this unit. CAO 31/10/2008