Gain Notes for Revolution 855
	
JEM-X1: A quite normal revolution with fine gain fitting. All the data from 
this revolution should be useable. The Xe analysis confirms that the energy
determination for this revolution is okay, within about 3-4% of the ideal. 
However, to get even better energy correction requires using an IC gain
history table (see below).
As for all revolutions, the first few science windows should be
avoided in any analysis requiring very good gain determination. Results shown
here use OSA8.0 software and so include temperature variation in the
smoothed gain model. 

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="<my subdirectory>/<IC filename>". 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.


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.

JEM-X2: 
There is a tiny amount of science data for this revolution from unit JEM-X2,
but since the unit was dormant for a long time, it was only switched on to
warm up, and the first useable data comes in revolution 856.

CAO 18/11/2009

JEM-X1 IC gain history table created, verified and delivered
Using IC gain historyt table, individual SCWs have energy correction within 2% of the
ideal, and the average Xe position is 29.6 keV 
CAO 2/12/2009