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A peptide's perspective of water dynamics: the motions of water nearby to an amide cause the amide vibrational frequency to fluctuate. The time autocorrelation function of these fluctuations (the FFCF) is manifested in the 2D spectra as changes of spectral shape with the waiting time T. The spectral shape change can be quantified by measuring the slope of the 2D contours as a function of T.
