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16 Fig. 2 - The before and after test of the new HRC-S QE model based on 10 years of accumulated HZ43 calibration data. correction uncertainties. Data showing the non-grey gain sag were carefully excluded. The most up-to-date non-LTE pure hydrogen atmospheres available were computed by Thomas Rauch at the Eberhard Karls Universität Tübingen. Curves, bumps and wiggles in the data/model residuals were liposuctioned out and the QE smoothed out and stitched back together. The before and after comparison of residuals for HZ43 are illustrated in Fig. 2. The largest correction is the smoothing out of the S-shaped chicane in the residuals in the 60–90 Å region—a legacy from the earlier Sirius B-HZ43 compromise. So, now that the HRC-S gain has been fixed, secular decline in QE is incorporated and it has been re-calibrated throughout its working range—covering a huge factor of 140 in energy—are we finished? Well, the problem is that the high voltage change to the detector will likely have an effect on the QE: once the optimum new settings have been established we will need to start over again. . . JJD thanks Ralph Kraft and the LETG team for useful comments and discussion. References Beuermann, K., Burwitz, V., & Rauch, T. (2006). A&A 458: 541. Kaastra, J. S., Lanz, T., Hubeny, I., & Paerels, F. B. S. (2009) A&A 497: 311 Pease, D. O., Drake, J. J., Johnson, C. O., et al. (2000). Proc. SPIE 4012:700. <strong>CXC</strong> Newsletter <strong>Chandra</strong> Related Meetings Check our website for details: http://cxc.harvard.edu/ 50 Years of X-ray Binaries July 10–12, 2012 DoubleTree Guest Suites, Boston, MA http://cxc.harvard.edu/cdo/xrb12/ Einstein Fellows Symposium Fall 2012 http://cxc.harvard.edu/fellows/
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