Gain Notes for Revolution 662 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 good, within about 2% of the ideal. However, as for all revolutions, the first few science windows should be avoided in any analysis requiring very good gain determination. It is not yet clear what causes the steady decrease in the Xe line position, though this is small, but it will be investigated. JEM-X2: No scientific data or gain history data for this unit. CAO 28/3/2008