Gain Notes for Revolution 606 JEM-X1: A quite normal revolution with fine gain fitting. All the data from this revolution should be useable. The Xe line analysis confirms that the Xe line position for each science window is within 2-3% of the ideal value. However, as for all revolutions, the first few science windows should be avoided in any analysis requiring very good gain determination. Future developements of the energy calibration of this instrument will include a temperature dependent component to the gain smoothing which may improve the gain calibration so that it will fall within 1% of the ideal. JEM-X2: No scientific data or gain history data for this unit. CAO 4/12/2007