The resonance of the axial H-9a in α-santonin (500 MHz, CDCl3) exemplifies how clear definitions of the terms pattern, peaks, lines, and transitions are key for the interpretation of the observed signal, and for all scientific communications of such matter. Refer to the main text for further explanations. In this example, the numbers of peaks vs. lines are identical (six), due to the very large number and very close proximity of the underlying 155 transitions. This myriad of transitions can be considered as producing 155 lines that are indistinguishable with current instrumentation. Note the differences in the exact positions of the individual peaks of the apparent dt/ddd pattern vs. those of the lines in the first-order coupling trees that represent the J-couplings with the geminal H-9b,(13.66 Hz), the vicinal H-8a (4.63 Hz) and H-8b (13.16 Hz), and long-range with the angular Me-14 (0.76 Hz). This apparent mismatch in fact shows the subtle but important difference between the first-order assumption of a visual interpretation and the true spin parameters determined by QM-based full spin analysis. This case also exemplifies why non-QM-based fitting methods (peak deconvolution) and automated methods of multiplicity analysis will intrinsically yield inaccurate results, with the level of inaccuracy and deviation from truth depending on the particular spin system.