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Typical dependence of the speckle contrast 
versus the detector aperture 
(a), the variations of the SNR (or quality, in arbitrary units) for a point detector (b) and with as the CCD pixel size (c). Curves (b) and (c) cannot be compared. In the case of an area detector, the 22 µm pixel size, at this 2 m distance, is an optimum, and one should not bin pixels of the CCD.
