Gain Notes for Revolution 628 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 3% of the ideal. There is a great deal of noise in the Xe line evolution because many of the pointings were relatively short, and the Xe line was correspondingly weak. However, as for all revolutions, the first few science windows should be avoided in any analysis requiring very good gain determination. JEM-X2: No scientific data or gain history data for this unit. CAO 4/2/2008