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Simulated global count rates for increasing phantom diameter (left to right). (a)—(c) 20 cm, (d)—(f) 27 cm, and (g)—(i) 35 cm from left to right. From top to bottom: (a), (d), and (g) true, (b), (e), and (h) scattered, and (c), (g), and (i) random coincidences.
