Fig. 4.

(a), (b) Wavelength dependences of ${\mu }_{\mathrm{a}}$ and ${\mu }_{\mathrm{s}}^{\prime }$ of epidermis + dermis before and after sample preparation. The solid and broken lines show the values before and after sample preparation, respectively. (c), (d) Spectral dependences of the relative differences between the ${\mu }_{\mathrm{a}}$ and ${\mu }_{\mathrm{s}}^{\prime }$ of epidermis + dermis before and after the sample preparation. The solid line and dotted lines represent the relative differences of the ${\mu }_{\mathrm{a}}$ and ${\mu }_{\mathrm{s}}^{\prime }$, with ±1 SD, respectively.