Gain Notes for Revolution 405 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. A large glitch can clearly be seen on source 1 (black/red), but this has no significance for the gain smoothing or science data. CAO 11/06/2008