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Fig. 1

Cophasing sensor signal as a function of the wavefront step: in the monochromatic regime (top) intrinsically limited by the π-ambiguity, using the coherence method (middle) with an extended capture range of ±Lc, and using the doublet-wavelength coherence method (bottom) with a broad capture range limited to ±ℒc.
This figure is made of several images, please see below:
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