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The reconstructed volumes from images with SNR = 1/64 and the MSEs (8.2) of the estimated rotations using spectral norm constraints (i.e., α = 0.90, 0.75, and 0.67) for all algorithms. All the volumes have size 129 × 129 × 129 voxels. The result from the IRLS procedure with α = 0.67 for the spectral norm constraint is best.
