Gain Notes for Revolution 340
	
This is one of the last revolutions to have a pre-switch on
with HV set three steps below nominal. The procedure was changed beginning with
revolution 343 because gain overshoot and decay at the beginning of each 
revolution was really only a problem at the beginning of the mission.
The large gain increase at the beginning of the revolution is due to the 
long time available for the plate to `relax' (ion migration) while the unit
was switched off during revolution 341.
This revolution is very short because the unit was switched off to protect it
from the high radiation level, seen here as increased glitch activity on all
sources. The unit remained off during revolution 341.
Gain smoothing is fine. All data from this revolution should be useable.

The Xenon line analysis of the science data shows that the position of the
Xe line lies between 29 - 30 keV as it should - even the science windows just
after switch on are acceptably close to the ideal value of 29.6 keV. Hence the
gain correction of the science data seems to be very good.

CAO 7/2/2007