Three Detectors
In the payload there are three detectors; two Geiger counters and a Scintillator. The image bellow is a vertical representation of the three detectors. The colored lines depict the path a muon could pass through for the coincidence circuit to count a muon.
The area from the red lines to the green is called the detection window. The detection window is the are in which a muon could pass though to get a reading. A muon has to pass though at least two of the three detectors for there to be a count.