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Definition of local distortion. a, When pointing accurately, the endpoint positions (•) reproduce the spatial organization of the target locations (○). b, Transformation from target to endpoint positions with a large constant error but no local distortion. c–f, Types of local distortion that can be introduced by a linear transformation, excluding rotations: local expansion (c), local contraction (d), anisotropic expansion, and contraction aligned with two different axes (e, f).
