Gain Notes for Revolution 427 JEM-X1: This is a perfectly normal and well-behaved revolution. The gain fitting has performed without problems, and all the data from this revolution should be useable. The Xe line position for 21 revolutions within the stabalized part of the revolution is at 29.83 keV, which indicates fine gain calibration for this data. JEM-X2: No data or gain history table for this unit. CAO 18/04/2006