Gain Notes for Revolution 615 JEM-X1: A quite normal revolution with okay gain smoothing. However we can clearly see that the temperature-varying gain of the detector has not been fitted by the smoothing procedure and the Xe analysis confirms that the energy determination for this revolution is only good to within about -4% to +3% of the ideal. As for all revolutions, the first few science windows should be avoided in any analysis requiring very good gain determination. Since the temperature variation of the gain has tripled since the beginning of the mission, future offline calibrations including temperature dependency, will definitely benefit this revolution when they become available in the coming year. JEM-X2: No scientific data or gain history data for this unit. CAO 5/12/2007