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Typical SHWS spot patterns before the spots are focused on the wavefront sensing source or AO correction (a), and after AO correction (b). The spots are brighter and sharper after AO correction. These SHWS spot patterns are taken at a scanning field of 5° × 5°. Each wavefront sensor spot is sampled by 16 × 16 pixels on the CCD camera. The width of both images is approximately 465 pixels.
