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Fig. 10.
Illustration of the optimal envelope for the solution given in Eq. (17) and α = 1. The exact curve (1) and linear approximation (2) of Eq. (18) are shown as the blue and red dashed lines, respectively. The drawing is made for z0 = 1 m, and the multiple disks extending up to 0.5 m. These values are for illustration only.
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