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Depth-corrected FWHM photopeak energy resolution at 511 keV as a function of photon interaction position transverse to the anode strips for a collimated beam stepped across 3 consecutive anode strips (located at −1 mm, 0 mm, and 1 mm, respectively). The photons were electronically collimated, and the error bar corresponds to the 90% confidence interval of the fitted parameters.
