Fig. 4. Distance dependence of the dipole auto correlation function for the protein and the first hydration layer water around . The correlation function was taken from a 4.469 nm x 3.871 nm x 3.265 nm box including protein and water molecules. Displayed is the result, from top to bottom, for a distance of 18, 24, 12 and 6 Å between the surface of the proteins. In addition, the autocorrelation function for bulk water is displayed. The result was used to calculate the THz absorption in Fig. 2 of the paper.