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Fig. 2
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Piston-removed zonal spatial covariance matrix using lexicographic indexing for a pupil shown in Fig. 1. The equation in the title corresponds to the development of 〈‖ϕ − ϕP‖2〉, where the piston mode is ϕP = P ⋅ P⊤ ⋅ ϕ.
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