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A PEF’s depth sensitivity versus its probe width where the black squares, red circles, and green triangles represent data obtained with the elastic moduli of the inclusions being 38 ± 4 kPa, 60 ± 5 kPa, and 145 ± 10 kPa, respectively. The blue dashed line with a slope of 2. Clearly, the depth sensitivity of a PEF was twice of the probe width, regardless of the elastic moduli of the inclusions. *Note the green triangles were taken from Ref. 38.
