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Variation in the total scattering cross-section of a dielectric sphere with ε = 10 and 2a = λ0/5 with: (a) the surface reactance of a mantle cloak; (b) the normalized frequency of operation for a cloak with ac = 1.1a and Xs = 175 Ω. Reprinted (figure) with permission from reference  Copyright (2009) by the American Physical Society.
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