Top: energy spectrum obtained with the 133Ba internal calibration sources for subcollimator 5. The count rate was 87 s−1. The expected background in flight for a large pixel is also shown. Two panels below: FWHM energy resolution for all 384 pixels at 31 keV (middle) and 81 keV (bottom). The better energy resolution of the small pixels can be clearly seen in the figure, resulting mainly from their smaller capacitance. At a shorter shaping time of 1.78 μs, the resolution is worse by about 200 eV.
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