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The surface detectors are evenly distributed across a 762 km<sup>2</sup> grid array with 1.2 km between each unit. Each surface detector has an assembled weight of 250 kg and consists of a power supply, two layers of scintillation detectors and electronics. Power is generated by a 120W solar panel and stored in a sealed lead-acid battery. The system has the capacity to operate for one week in complete darkness. Each scintillation detector layer is made of extruded plastic scintillator that is 1.2 cm thick and has an area of 3m<sup>2</sup>. The photo multiplier tube is connected to the scintillator via 96 wavelength-shifting fibers.
==FD station, telescope, and camera==
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