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RMS output errors obtained with the 32×32 element array evaluated in 3D volumes as a function of the input pressure plane location z0. The size of the input pressure plane is (a) 7.8 cm×7.8 cm (52λ×52λ) and (b) 20.4 cm×20.4 cm (136λ×136λ). The location of the input pressure plane ranges between z0=0 and z0=3.9 cm (26λ) with an increment of 0.15 cm (λ).
