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- "There are 4 2x1 sensors that do not work. There is also a single 2x1 slot on one of the PCBs that has a bad connection. So the sensor works, but we can't operate it.
- The inner, beam-side 2x2s have tungsten shields, but only one other 2x2 does. Many of these modules were used during Run3 and so have some radiation damage and chipped sensors." - from Chris
Run 4 XPP metrology (pre-run) , image
Wiki Markup quad order in file is \[0, 3, 1, 2\] from looking at IZM modules
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