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. 2018 Apr 10;9:1349. doi: 10.1038/s41467-018-03839-z

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© The Author(s) 2018

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Fig. 4 — Illustration of the result space for gradient space-coiling metamaterials with varying common ratio (CR). The colored region (pink) is the region defined by Eq. (25) and the dot points represent the results from TMM