Figure 9.

Computed 2D absorptive spectra using the ZZZZ scheme of cases where the α‐ helices a) and β‐strands b) of ubiquitin (1UBQ) are isotope labeled. The contours are plotted with a 10% intensity of the maximum amplitude and 20 uniformly spread contours from the minimum to the maximum intensity for the left panel and 20 similar uniformly spread contours for the right panel. The isotope labeled components are highlighted with red dotted squares and the cross peaks with white dotted ones. [Color figure can be viewed at wileyonlinelibrary.com]