Fig. 6
A Star Challenge non-turbulent PSF (left) compared with a turbulent PSF (right). Each “whisker” represents the amplitude |e| of the ellipticity of stars. The largest whisker in the left hand side image corresponds to an ellipticity of 0.16. The right hand side image has a maximum ellipticity of 0.37. The ellipticity plots have respectively been made from the first PSF field image of sets 8 and 14.
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