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. 2005 Sep 2;102(37):13081–13086. doi: 10.1073/pnas.0406877102

Fig. 2.

Fig. 2.

Structured-illumination concept. (a) The set of sample spatial frequencies that can be observed by the conventional microscope defines a circular observable region of radius k0 in frequency space. (b) If the excitation light contains a spatial frequency k1, a new set of information becomes visible in the form of moiré fringes (hatched circle). This region has the same shape as the normal observable region but is centered at k1. The maximum spatial frequency that can be detected (in this direction) is k0 + k1.