A separate analysis of the protein, heme, and solvent contributions to the total power spectrum of the autocorrelation function of the force acting on the C-D bond at 300 K. (a) The total spectrum and the spectrum obtained by decomposing the force autocorrelation function into separate protein, heme, and solvent contributions and ignoring cross correlation. (b) The spectrum of the separate components of the protein, heme and solvent. All spectra have been smoothed for visual clarity.