Gain Notes for Revolution 798
	
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 good, within about 2% of the ideal. 
However, 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. 

The generally low level of the Xe line is an artifact produced by the high
gain pushing the line towards the upper end cutoff of the instrument and is
not indicative of a general problem with the gain correction, but only with
finding the centre of the Xe line.

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 27/5/2009


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 very
good gain calibration for this revolution with all except the very first Science
Windows, having a Xe line position with about 1-2% 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 29/5/2009