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. 2022 Feb 22;23(2):407–430. doi: 10.1007/s11047-022-09880-8

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Fig. 11 — Left: an xy-connected y-monotone shape S containing 6 points, along with a yw-separator C (in purple). Right: grid points in black show $S_{\times 2}$ which is the factor-2 scaling of S and the separator C (in purple) that separates $S_{\times 2}$ into $S_{\times 2}^{'}$ (left) and $S_{\times 2}^{''}$ (right)