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Warning: SIS Gain Problem

We have discovered a significant problem in the gain calibration of SIS data,
particularly for SIS-1 data taken during AO-8 (calendar 2000). It appears that
the Charge Transfer Inefficiency (CTI) is evolving non-linearly with time,
whereas we currently use linear extrapolations from the last determination of
CTI values on 1997 March 11. 

Please consult the preliminary report we have posted at:


for further details.