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If you prefer to listen instead of Reading below is a link to a video explanation of imagers/PPM. Furthermore, for quick information the times and concepts of the video are given below.
https://confluencedrive.slac.stanford.edu/pages/viewpage.action?pageId=314561151google.com/drive/u/1/folders/1Gr-6FmxK1F9tREUs7z3wuE-vIlGCMKaQ
If you would like to learn more about PPM controls and product names, click the link below to another confluence page.
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