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The plots from my IACHEC talk which are possibly paper-worthy plus some text.
The fractional change in the centroid of the Mn-Kalpha line as a function of time. The left panels are for the XIS detectors on Suzaku and the right panels are ACIS on Chandra. The top panels are representative front-illuminated devices (XIS3 and ACIS-I3) while the bottom are back-illuminated (XIS1 and ACIS-S3). The triangles indicate XIS data with charge injection turned on - ACIS does not have the ability to inject charge.
The change in the line centroid in the absence of any other gain or electronic changes, can be used as a proxy for the change in charge transfer inefficiency (CTI). Radiation damage increases CTI, which in turn decreases the line centroid for data far from the detector readout. The decrease in the line centroid for both XIS and ACIS is due to increasing CTI from radiation damage. Turning on the charge injection for XIS both improved the CTI and decreased the rate of change of CTI.
The rate of change for the two instruments is quite different.
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