Gain Notes for Revolution 358
	
 This revolution has a real problem, one that we've not encountered before.
 A single point for source four at a value of 145 has totally thrown off the
 automatic gain smoothing produced by j_cor_gain 6.4. This is the last data
 point for the last source before the switch off, so the very low value is
 probably caused by incomplete spectral integration or simple truncation of
 the raw data. The data point is down at ADC=95 and cannot even be seen on the
 figure of the Cd source peak positions, though its effect clearly can be seen.
 
 This means that the gain correction derived automatically for the first part 
 of the revolution, up until the autonomous switch off at 2088.12 IJD, cannot 
 be used, and the energy corrections performed on the data will be incorrect.
 All data after the re-activation is unaffected by this problem. While the
 Xenon lines derived from 62 science windows, mostly in the centre of the
 revolution, look good, certain individual science windows, especially right 
 before the switch-off, will be very strongly affected by this problem. 
 
This problem has been corrected in the latest release of OSA (6.0). A corrected
gain history table created offline has been delivered to ISDC as an IC file, and
the OSA scripts can track down these IC files if they exist for a particular
revolution (very few revolutions actually need this sort of intervention). The I
C
files are used instead of the automatically generated gain history tables create
d
at ISDC. The Xe line position evolutionm characteristic histograms and Xe/Mo
lines, averaged over the available survey data (62 pointings), were produced 
using data corrected with the IC file. If you don't have OSA 6.0 installed, or
are lacking the IC files, use the quick fix described below - it's the same
IC file.


 QUICK FIX: Download the corrected IC gain history table from the `Other data
 and results' column of the table containing these notes. It is the gzipped gain
 history IC table in FITS format with the data for Cd source 4 corrected.
 Unzip the file and put it in the directory from which you are doing 
 your data analyses, say <myDir>. When you run the JEM-X Science Analysis 
 Pipeline (GUI) you will have to edit the hidden input parameter `gainHist' thus:
 gainHist = "<path to myDir>/<myDir>/JMX1_gainHistoryIC_rev0358_001.fits[JMX1-GAIN-OCL,1]"


 Anyone who experiences any problems analysing this revolution should contact 
 Carol Anne Oxborrow at oxborrow@dnsc.dk. All users who are in any doubt about
 their results for any reason, are also welcome to contact me.
 
 JEM-X2: there is no gain history data or science data for this unit.

CAO 26/9/2006