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(a) Side view of chicken breast piece used for depth of penetration measurement (b) Overhead view of the chicken breast piece (c) Maximum intensity projection PAM image of the hairs inside the chicken breast. The hair on the left side of the image is close to the surface and the hair on the right side of the image is about 2 mm deep. (d) B-line image along the dashed line in Fig. 4(c). Color bars represent normalized PA amplitude.
