Gain Notes for Revolution 1934

N.B.: This revolution has very weak Xe lines and determining the goodness of the
energy corrections is not possible for some science windows. However, the vast majority
of SCWs are well fitted, and so long as the SCWs on either side of a weak SCW are well-determined
it can be assumed that SCWs with very weak Xe lines that cannot be found, are also well-determined.

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: Very good (Xe line positions within 2-3% of ideal, except for the weak
		misfitted science windows)

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

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

CAO 29/03/2018