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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Methods. 2017 Oct 25;136:35–39. doi: 10.1016/j.ymeth.2017.10.006

Fig. 2.

Fig. 2

(a) Fourier transform of the grid interference pattern. (b) Spatial frequency of the sample masked by the numerical aperture size in the Fourier space. (c), (d) background phase curvatures corresponding to λ = 430 nm and λ = 630 nm, respectively. The scale bar is 10 µm.