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Comparison between the synthesis after the propagation of each angular image and the propagation of a synthesized image. (a) Phase part of the synthesized image at the original focus. (b) Same as (a) but each angular image is propagated by 7 µm. (c) Direct application of angular spectrum method for the synthesized image taken at the original focus. Color bar, phase in radians. Scale bar, 10 µm.
