Gain Notes for Revolution 39
	
JEM-X1: The gain smoothings shown are for the gain history tables created
by j_calib_gain_fitting 7.1 and version 7.2.  The first of these produce
a long period of null values due to very heavy grey filtering of the data.
The later version could deal with this grey filtering and produced a 
complete table with a fine gain fitting. The break seen in the reprocessed
gain history table is a genuine break in data taking during which time the
unit was in standby mode. The position of the Xe line for all of the 33 SCWs
is very good (these results processed by j_calib_gain_fitting 7.2 and 
j_cor_gain 7.2). The steady increase in the Xe line position at the beginning
of the revolution is due to a warmup effect whereby the metal ions from the
microstrips settle in the glass as the HV supply is switched on. While the
effect is not large, a few percent at most, users should be aware that this
happens and small changes in a line position between the beginning and end of a
revolution should not be assigned any scientific importance.

JEM-X2: All the same comments apply as for the JEM-X1 unit but only the 
results for j_calib_gain_fitting 7.2 are shown for this unit.

The data for this revolution was reprocessed with the newer version of
j_calib_gain_fitting to make a fuller gain history table on 9/11/2005:
0039 : 2005-11-09T20:51:48 j_calib_gain_fitting 7.2


ONLY DATA PROCESSED WITH THE GAIN HISTORY TABLE FROM rev.002 OR LATER
REPROCESSINGS SHOULD BE USED. If in doubt, download the latest rev.00n data
(n>1) and using the OSA software process your data from the COR (correction) 
level onwards.



CAO 19/09/2006