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. 2017 Apr 3;7:552. doi: 10.1038/s41598-017-00622-w

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© The Author(s) 2017

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PSF localization accuracy. Localization errors in x, y and z are plotted as a function of z. (a) Double helix PSF. (b) Saddle-point PSF. The solid lines are the Cramer-Rao theoretical bounds calculated following ref. 8.