The original version of this Article contained an error in Figure 12, where the figure legend within the image was reversed.The legend of the black curve now reads: "With phase pattern, Azimuth Gain 8.9 dB.", and the legend of the blue curve now reads: "Without phase pattern, Azimuth Gain 7.5 dB.
Bruna et al. (Fri,) studied this question.
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