Gain Notes for Revolution 452 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. Like the previous revolution there are several big glitches visible on iron source 1 (black/red ), but these are well smoothed by the gain correction program and in no way affect the science data. JEM-X2: No scientific data or gain history data for this unit. CAO 23/06/2008