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Hydration dependence of THz refractive indices. Refractive indices of Ferri (solid lines and symbols) and Ferro (dashed lines and open symbols) CytC are shown for several representative frequencies as a function of % hydration. Lines are drawn as guide to the eye showing an apparent saturation point at 20–25 wt % hydration. The rapid turnover of the hydration dependence is nearly frequency-independent in contrast to the absorption coefficients shown in Fig. 2.
