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(a) Optical penetration depths at spot diameter of 3 mm and wavelengths currently available for clinical use in dermatology and plastic surgery. (b)–(d) Comparisons of at spot diameters of 2, 3, and 4 mm among the three ethnic groups. The broken lines at 0.15 and 1.65 mm show the boundaries between the epidermis and the dermis and between the dermis and the subcutaneous fat, respectively.
