Gain Notes for Revolution 246
	
JEM-X1: A quite normal revolution with fine gain smoothing. All data from 
this revolution should be useable.
The first three points of each data set are the partial switch-on with the High 
Voltage 3 steps below its nominal value.
The average Xe position is 29.3 keV and lies somewhat below the ideal value of
29.6 keV, but this is almost by design, since revolution 246 lies at the very
beginning of calibration epoch 10. As gain increases with additional use of the
unit, revolutions at the beginning of an epoch tend to have Xe lines just below
29.6 keV and those at the ends of an epoch have positions above 29.6 keV. 
For details see introductory link `What is differential gain aging?'. 
However, these small differences in Xe position found for the revolution are well
within the noise of the calibration data, and signify  that the gain correction has 
functioned correctly during the entire revolution, with the possible exception 
of the partial HV switch-on right at the beginning of the revolution. With
this exception, all the science data should be well-behaved.


JEM-X2: No gain history or science data for this revolution


CAO 12/06/2006