2D NOESY experiment provides a 2D 1H-1H chemical shift correlation map in which two different type of peaks are clearly differentiated. Diagonal peaks correspond to auto-correlation peaks whereas the important NOE connectivities are traced out from the non-diagonal cross-peaks. It is very important to consider the phase between diagonal and non-diagonal cross-peaks in order to analyze and interpretate correctly the resulting spectra. See list of NOESY spectra.