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Test image preparation. (a) Clear projection of GroEL/ES (PDB code:1AON). This is a projection of small Gaussian functions (std=2Å) assigned at all Cα’s. (b) Addition of the Gaussian noise and (a). (c) Image obtained by aligning and averaging many noisy images clipped by a circular window. (d) Image obtained by subtracting the mean intensity of the background noise from (c).
