For the molecules here considered, this is the situation of the carbon and hydrogen atoms that are attached in positions equivalent with respect to the N --N bridge. As an example, the hydrogen nuclei H2 and H4 can, on the timescale of the NMR experiment, exchange their positions due to the rotation of the phenyl ring along the N -C2 bond. This is reflected experimentally in the NMR spectrum of azobenzene, which shows a single peak at identical frequencies for these nuclei. As noted above, since NSCD is modulated by the time evolution of the magnetization the same way as NMR, the same effect will also apply here. This means that although the calculated results will show different NSCD for these nuclei in the presented static structure, the more appropriate interpretation of the results from the experimental point of view is to average these NSCD signals. This is analogous to a common practice applied in the analysis of calculated NMR chemical shifts. For this reason, the sum of NSCD for nuclei considered as NMR-equivalent is also reported as this is more relevant to the experimental measurements than the individual, practically unobservable, contributions from an instantaneous structure.