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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. To compare to XIS, the FI CCDs on XIS drop 5 times faster than ACIS, the BI CCDs drop 9 times faster than ACIS. (The XIS numbers are with charge injection on, but before the BI charge injection was increased.) So the difference in CTI evolution between ACIS and XIS may be entirely due to the focal plane temperature?
(The FWHM of ACIS-S2 at -90C is so large that the Mn-K line is hopelessly entangled with the Mn-Kbeta and Ti-K lines, so I haven't extended this analysis to FWHM.)
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