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letter
. 2020 Nov 10;20(22):6426. doi: 10.3390/s20226426

Figure 5.

Figure 5

Wavefront map obtained with Fourier demodulation on direct beam by vertically displacing circular area of interest by (a) −10 pixels or −0.14 mm, (b) 0 mm, (c) 10 pixel or 0.14 mm, and (d) 30 pixels or 0.39 mm.