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The spectrally resolved vibrational echo peak shift as a function of Tw for H64V as the viscosity is increased. The viscosities of the data are 3 cP (solid squares), 40 cP (solid circles), 660 cP (solid triangles), 6400 cp (open squares), 28,000 cP (open circles), and in a sugar glass (open triangles). The vibrational echo peak shift indicates that spectral diffusion becomes significantly slower, but does not completely vanish as the viscosity is increased.
