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Standing waves in the brain measured at insonation frequencies of 0.268, 0.841, 1.409, 1.972 and 2.530 MHz. The profile through the focus is measured before (thick line) and after insertion of the skull sample (thin line) and the data is normalized to the maximum pressure before skull insertion. Bottom right shows the standing waves profiles at 268 kHz and 1.972 MHz normalized to maximum amplitude
