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Fig. 6.
S/N in PB image intensity for a 10% sound-speed perturbation over a volume Vs(zs) placed at zs along the polar axis (Eq. (54)). The results are shown at a single frequency of 3 mHz (solid curve) and after averaging over 101 frequencies in the interval from 2.75 to 3.25 mHz (dashed curve).
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