Gain Notes for Revolution 1860

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.

N.B.: This revolution also heavily disrupted by a strong solar flare that forced
early shutdown of the instruments which continued for the following revolution.
The energy determination in this revolution for JEM-X1 is within about 5% of the ideal, 
which only rates as 'Acceptable' (total energy determination can vary by as much as 10%
between science windows) - so use this data with caution for energy-sensitive
applications. Results for JEM-X2 are much better, within 2-3% of ideal, but caution
should still be exerciese. 

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 (within about 5% of ideal)

JEM-X2 rating: Very good (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 to weak to use.

CAO 29/09/2017