Version 1.0 - Preliminary version submitted to Marshall Space Flight Center, October 13, 1997.
Version 1.5 - Draft of final pre-launch version for review by Marshall Space Flight Center and AXAF team, July 15, 1998.
Version 2.0 - Final pre-launch calibration report submitted to Marshall Space Flight Center, October 15, 1998.
Version 2.2 - Final pre-launch calibration report after full ACIS
team internal review, January 15, 1999.