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. Author manuscript; available in PMC: 2014 Mar 26.
Published in final edited form as: SIAM J Imaging Sci. 2013 Dec 3;6(4):2450–2483. doi: 10.1137/130916436

Figure 9.

Figure 9

Initial models and refined models. (a) The ab initio models estimated by merging two independent reconstructions, each obtained from 1000 class averages. The resolutions of the models are 17.2Å, 16.7Å, 16.7Å, 16.7Å, and 16.1Å (from top to bottom, left to right) using the FSC 0.143 resolution cutoff (Figure 10). The model using the IRLS procedure without the spectral norm constraint (i.e., α = N/A) is not available, since the estimated projection directions are highly clustered. (b) The refined models corresponding to the ab initio models in (a). The resolutions of the models are all 11.1Å.