670914.fig.004a
(a)
670914.fig.004b
(b)
670914.fig.004c
(c)
Figure 4: (a) A typical fitting curve for along with the experimental points in complete frequency range. (b) Fitting for the same curve in the higher frequency range above the arrow marked in (a). (c) Fitting for the same curve in the lower frequency range below the arrow marked in (a).