Variations of line centroid energies for four strong lines with time. Each data point is the result of a fit for data from one orbit. Each line apparently has its own systematic offset, superimposed onto variations of 0.01 to 0.03 keV. Degradation effects are evident, strongest for the 205Bi line. The corrections of orbit-by-orbit gain variations in preprocessing by using centroids of fitted symmetric Gaussians leads to gradual shifts of calibration peaks, which is then observed as positive energy shift in the asymmetric line fits reported here.
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