English: X-ray ptychography at a small-angle scattering beamline of a synchrotron. (a,b) Recovered modulus and phase of the outer region of a zone plate, serving here as a sample. An improvement in reconstruction quality is apparent (comparing reconstructions from 2008 and 2015): small bridges for stabilizing the ring structure are visible in (i) but not in (l). Deviations of the outer zones from a circular path can be observed in (j) but can only be guessed from (m).
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