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. 2020 Sep 24;10:15677. doi: 10.1038/s41598-020-72668-2

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© The Author(s) 2020

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Plots of the FWHM between different angles compared with the diffraction limit in the x and y directions. (a) FWHM in the x direction and (b) FWHM in the y direction. Focal length is approximately 38 µm and the NA is about 0.25.