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(A) The phase retrieval transfer function (PRTF) of a reconstruction. Defining a cutoff of 0.5 predicts a spatial resolution of π/57 μm-1 ≃ 55 nm. (B) Line cut (r) through two domains shown in inset. The 10% to 90% edge response gives a resolution of ≃80 nm. The point spread function of the imaging process blurs the Bloch wall width of ≃30 nm, which accounts for the discrepancy.
