903450.fig.004a
(a)
903450.fig.004b
(b)
Figure 4: (a) Raman spectra after baseline corrections for the Black, Asian, and Caucasian models, respectively. (b) Time-dependent intensity profiles for the Black, Asian, and Caucasian skin types. For the data points, solid circles, asterisks, and open circles are used to represent the intensity values at 1007, 1662, and 1455 cm−1, respectively.