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Contributions to Var(D2) via the sum in Equation (26). The left-hand diagram shows the (i′, j′)-plane for a fixed value of (i, j), shown as the black square. The right-hand diagram is an expanded view of the “accordion” region −k + 1 ≤ s, t ≤ k − 1, where t = i′ − i and s = j′ − j up to PBCs [see Equations (41) and (42)].
