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BRCSs calculated from the measured field distributions for the incident angles of (a) θinc = 0∘, (b) θinc = 30∘, (c) θinc = 45∘, and (d) θinc = 60∘. In each figure, the red solid line is for the cloak, the blue dashed line is for the original area and the green dot-dashed line is for the slope.
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