FIGURE 5.

Six exploratory calculations are presented in an attempt to identify the physical origins of spectral features in trpzip2. (A) All elements of the Hamiltonian set to their average value. (B) Site energies set to their average value, couplings sampled from MD. (C) Couplings set to their average value, site energies sampled. (D) All elements sampled. (E) Couplings set to their average value, site energies sampled from a Gaussian distribution with center and width corresponding to MD site energy statistics. Twenty-one evenly spaced contours are plotted from ±50% of the maximum for each spectrum.