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![[Figure 7]](ig5091fig7mag.jpg)
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Figure 7
Dynamic X-ray diffraction data showing after-image subtraction. (a–b) Two frames of XRD data collected during shock compression of HOPG are shown, with no after-image subtraction. (a) The XRD pattern from the sample is shown, 144 ns after impact with 47% of the HOPG compressed. The bright peaks throughout the image are from the remaining ambient HOPG. (b) The XRD pattern from the subsequent frame, at 297 ns after impact with 98% of the HOPG compressed. The bright peaks should be essentially gone, yet they remain visible due to the after-image of the previous exposure. The inset shows an exploded view with two of these peaks. The diffuse peak in the center of the inset is from the shocked state. (c) The image from (b) is shown after the after-image subtraction is applied, showing that the peaks are removed. (d–e) Exploded views of the peak in the blue box from (b–c), before and after subtraction, displaying a slight oversubtraction in some pixels and under-subtraction in others. This data was explored in detail by Turneaure et al. (2017  ), where these peaks were removed by subtracting an empirical fraction of the ambient image. |
![[Figure 7]](ig5091fig7.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
