Gain Notes for Revolution 945
	
JEM-X1: No scientific data or gain history for this unit.


JEM-X2: A revolution with weak calibration spectra in one source leading to
poor gain smoothing and poor energy determination.

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.


Xe line analysis of the corrected science data using the IC table as
described above shows that the energy correction is excellent, within 2%
of the ideal value, though as always the first few science windows should
be avoided for energy-sensitive applications.

CAO 24/08/2010