Gain Notes for Revolution 961
	
JEM-X1: No scientific data or gain history for this unit.


JEM-X2: This revolution is affected by the non-linear temperature effect
that can suppress the instrument gain at high gain and therefore needs an
IC gain history table to correctly process the science data and provide
the correct 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. The updated ISDC Instrument Characteristics
can be downloaded from
http://www.isdc.unige.ch/integral/download/osa_sw


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.


The Xe line analysis performed using the IC table shows excellent gain
correction with all science windows having a Xe level 
within 2% of the ideal. 

CAO 3/09/2010