For the Tokmakoff model (Fig. ), the predictions of the vibrational map cover a smaller range of wavenumbers. For the four polyalanine models, the agreement between predicted and reference local-mode frequencies becomes significantly worse, and in the plots, they appear to correlate with a slope different from one. The systematic shifts (MEs) now vary between +8.7 and -14.4 cm -1 , and the RMSDs increase to ca. 7.3-11.5 cm -1 . Nevertheless, for the 1GPB 3 10 -helix and for Trpzip2, the overall correlation is comparable to the other two models, with RMSDs of 13.6 and 17.0 cm -1 and R 2 of 0.80 and 0.69, respectively.