Gain Notes for Revolution 423 JEM-X1: This is a perfectly normal and well-behaved revolution, after all the excitement of the Crab calibration. The gain fitting has performed with out problems, and all the data from this revolution should be useable. Big glitches are visible on sources 1 and 3 - the latter being quite an unusual event. JEM-X2: No data or gain history table for this unit. CAO 4/04/2006