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Measured CTR for sparse sensor readout configurations with 10 and 20 mm length crystals are shown in (a). The terms “OB” and “CB” are used to denote open and closed bottom, where the portion of the scintillation light exit interface of the crystal not coupled to SiPMs is either left open or covered with ESR reflector. An example of the affect on the 511 keV photopeak with a 20 mm length crystal having sparse sensor readout and OB (green) and one where the bottom is covered by SiPMs.
