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The top panel is for ACIS-S2, the bottom for ACIS-S3. (There's isn't any data for I3 in 1999, so I've switch so S2 which is also an FI device but has higher CTI.) The data points are showing the centroid pulseheight as a function of focal plane temperature (measured in the same regions and the same way as everything above.) The later data has lower pulseheights which is consistent with the CTI increase. For both devices the size of the increase is larger at -90C than it is at -120C.
More specifically...
- S3 at -119C, the peak drops by 0.8%
- S3 at -90C, the peak drops by 2.1%
- S2 at -119C, the peak drops by 2.0%
- S2 at -90C, the peak drops by 9.9%
For S3, the drop is 2.7 times faster at -90C than at -120C. For S2, the drop is 5.1 times faster at -90C than at -120C.
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