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Results of the power reconstruction 〈ŝ(r, t)2〉. (a) Conventional eigenspace beamformer was applied to the recordings with no background interference. (b) Conventional eigenspace beamformer was applied to the recordings with background interference. (c) Prewhitening beamformer reconstruction [see (27)] was applied to the recordings with background interference. In these results, the reconstruction grid has 0.1-cm intervals in the y and z directions.
