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. 2017 Jan 9;8(2):653–669. doi: 10.1364/BOE.8.000653

Fig. 4.

Fig. 4

The histograms of Fig. 3. The horizontal axis represents phase retardation. The subfigure labels correspond to those of Fig. 3. The dotted line represents the 2π/3, to which the mean estimation erroneously converges as the ESNR decreases.