Gain Notes for Revolution 2542

Note: This revolution is dominated by the Crab initially, which swamps the 
	Xe line photons making it very difficult to find the Xe lines, 
	so that the goodness of the energy determination is hard to 
	determine here. Also we see rapid change in gain due to count-rate 
	induced gain suppression by the strong source in the FOV. 

This is one of the later revolutions in the mission where the calibration
sources have become so weak that for the best energy determination and
IC Gain History table is needed.
 

To get optimal results with this revolution it is necessary to use the IC gain history.
See notes in revolutions prior to revolution 1433 to find out how to do this
if you don't already know.

All offline gain/energy corrections (including the IC tables) are based on the
two Fe calibration sources in JEM-X1, for both units.

Latest OSA software (version 10 and higher) automatically cuts out the first
Science windows of data from each revolution to ensure that people do not use data
from the instrument-settling period. This process can be overruled, but only by
experienced users.
	
JEM-X1 rating: Acceptable in first third (cannot be improved due to Crab in FOV), 
		and good in last two thirds (within 3-4\%\ of ideal)

JEM-X2 rating: Acceptable in first third and very good in last two thirds 
	(within 2-3% of ideal)

The JEM-X2 corrections are based on the JEM-X1 Fe calibration sources, since
all the Cd sources are now too weak to use.

CAO 31/08/2022