Gain Notes for Revolution 912 JEM-X2: A quite normal revolution with fine gain fitting. All the data from this revolution should be useable. The Xe line analysis confirms the good gain calibration for this revolution with all the Science Windows having a Xe line position with about 2% of the ideal value. As always, however, it is suggested that users avoid the first few science windows in each revolution since this is where the instrument warms up and gain variations across the plate settle down. CAO 28/04/2010 Gain Notes for Revolution 912 JEM-X1: Another SPI annealing revolution where the gain is very high indeed, up to 30 channels per keV. The high gain brings out the non-linear temperature effect in the instrument that cannot be compensated for automatically. Again, this first part of the revolution was declared a Bad Time Interval, and will be ignored by the OSA processing. The BTI is IJD= 3744.3 to 3744.5. To get optimal results with this revolution it is necessary to use the IC gain history table that has been created offline at DNSC, instead of the gain history table created automatically by OSA. If you have the newest package of IC files from ISDC and these are correctly installed, OSA will find the IC gain history table automatically and you don't need to do anything. However, if you don't have the IC gain table package from ISDC you can download the table from the gain history archive by anonymous ftp through the link provided. Download the table to some suitable subdirectory for your analysis, then set the hidden OSA parameter gainHist: gainHist="/". These files are used instead of the automatically generated gain history tables wherever there has been an unusual or non-linear behaviour of the detector gain. The Xe line analysis using the IC table confirms the excellent gain correction that is achieved if this table is used, with gain calibration within about 1-2% of the ideal for all science windows except the first ones. As always it is recommended that the first few science windows in the revolution are avoided for all applications requiring accurate energy determination. Calibration source number 4 (purple/orange) is no longer used for calibration purposes since an anode strip directly under the source has broken and no useable signal comes from this area of the detector any longer. CAO 21/05/2010