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The UVOT consists of five units (Figure 8): a Telescope Module containing a UV/optical telescope, a Beam Steering Mirror, two filter wheel mechanisms1, two photon counting detectors, power supplies, and electronics; two Digital Electronics Modules, each one containing a Data Processing Unit, an Instrument Control Unit (ICU), and power supplies for the Data Processing Unit and ICU; and two Interconnecting Harness Units to connect the telescope module to the two Digital Electronics Modules.