Phase lags and the coherence function of Obs #5 (left panel) and #4 (right panel) in Table 1. The red vertical line indicates the centroid frequency of the Type-C QPO, while the blue vertical line indicates that of the Type-B QPO. The models are not fitted to the data, but predicted on the basis of the parameters of the Lorentzians fitted to the PDS and the real and imaginary parts of the CS.