Within the framework of perturbation theory, which may not be strictly applicable in attosecond wave-mixing experiments, the intensity of resonant FWM emission signals can be approximated by the oscillator strengths of each stepwise transition between states in the wavemixing process, as well as the intensity of the XUV and NIR light utilized in each interaction. Assuming that the intensity of the broadband light sources is relatively constant within the energy region of interest, the oscillator strengths of different transitions can be utilized to develop an expectation for the dominant FWM pathway. As shown in Table , the oscillator strengths calculated for the initial XUV excitation are about 2.5 -10 times larger for the Henning diffuse states than for the sharp states, indicating that the XUV-induced coherent superposition being probed is dominated primarily by the short-lived diffuse states. In contrast, oscillator strengths calculated for NIR transitions between the bright states and the