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Examples of synthetic images (128 × 128 pixel, and 1 pixel = 160 nm): (a) Density = 0.005/pixel2 and SNR = 8. (b) Density = 0.006/pixel2 and SNR = 6. (c) Density = 0.007/pixel2 and SNR = 5. (d) Density = 0.008/pixel2 and SNR = 5.