| http://www.w3.org/ns/prov#value | - For example, such waves can be centered on-axis, such as by methods of adjusting corresponding transmit and/or receive delays, ??1, ??2, ??3 . . . ??N. An electronic focus can be suitably moved along various depth positions, and can enable variable strength or beam tightness, while an electronic defocus can have varying amounts of defocusing.
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