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Table 2

Top part: mean value of the reflection coefficient modulus for optimized ABHs with shape function described employing cubic splines with different number of control parameters. Bottom part: the case of non-optimized linear shape function, and optimized power-law shape function; N = 500, ξ = 0.5, Rmin = 0.25 mm.

Parameters | R | $ \left\langle |\mathcal{R}|\right\rangle$
7 0.0913
6 0.0930
5 0.0919
4 0.0947
3 0.0946
Linear (non-opt.) 0.1189
Optimized (α = 0.96) 0.1181

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