Gain Notes for Revolution 2430

This revolution was affected by a deep and sudden rise and dip in gain, that was
not due to significant increase in countrate around time IJD=7977.85. 
This has been fully corrected in the gain determination, but users should be
aware that this effect may be quite varied across the microstip plates, and
hence the average gain determined here may not be equally good all over the
detectors. 

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: Excellent (Xe line positions within 2% of ideal except for one
	slight outlier) 

JEM-X2 rating: Very good (within 2-3% of ideal throughout)

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 17/11/2021