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NRVS data recorded on a polycrystalline powder (a and b) and on an oriented single crystal (c and d) of Fe(TPP)(2-MeIm). The individual peaks are represented by dashed lines in c and d. The predicted two-quantum contribution, plotted as a red trace in a, has been convolved with Lorentzians of linewidth equal to the average of the linewidths of the contributing fundamentals. The red bars in a have heights proportional to the areas of the overtones and combinations.
