time dependent gain correction for ACIS I0-I3, S2, S3

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Dear Chandra user,

ACIS calibration group has developed an algorithm for correcting slow
gain changes in the ACIS CCDs I0-I3, S2, and S3. For details, please see
http://cxc.harvard.edu/contrib/alexey/tgain/tgain.html
This correction will be implemented inside acis_process_events in a
future release of CIAO. In the meantime, the equivalent software and
calibration data are available on the Chandra software exchange page,
http://cxc.harvard.edu/cont-soft/software/corr_tgain.1.0.html

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