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The source blur PSFs for a source of nominal size of 0.3 mm for pinholes at depth zpinhole = −50 mm at the projection angle θ = 0° at four different locations: (a) t = 10 mm, s = 0 mm; (b) t = 230 mm, s = 0 mm; (c) t = 10 mm, s = 140 mm; (d) t = 230 mm, s = 140 mm.
