 Saturation of the degenerate "W"1S transitions disturbs the equilibrium populations so that "P"αα = "P"αβ and "P"βα = "P"ββ.The system's relaxation pathways, however, remain active and act to re-establish an equilibrium, except that the "W"1"S" transitions are irrelevant because the population differences across these transitions are fixed by the RF irradiation while the population difference between the "W"I transitions does not change from their equilibrium values.This means that if only the single quantum transitions were active as relaxation pathways, saturating the formula_14 resonance would not affect the intensity of the formula_4 resonance.