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This graphic shows the detail of a possible configuration of the photomultiplier tube mounting structure for the WATCHMAN antineutrino detector, a key part of the Advanced Instrumentation Testbed. Modules containing sets of photomultiplier tubes are securely bolted to cables, which run the vertical length of the detector – like a giant Christmas decoration that absorbs light rather than emitting it. Drawings by Jim Brennan/Sandia National Laboratories, California.