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Fig. A.1
Value of Sn, for indices n = 3, n = 6, and n = 12 (left), and Wendland kernels C2 and C6 (right) in 2D (continuum thick lines). We show in dots the direct product 
(left) and 
(right) for the same set of indices. Increasing n, the sinc kernels approach separability in each spatial direction, while Wendland kernels do not.
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