Nodal precession frequency (solid line), periastron precession frequency (dotted line), and orbital frequency (dashed line) as a function of the nodal precession frequency as predicted by the RPM. The lines are drawn for mass M = 7.12 M_⊙ and spin a = 0.20. The corresponding radii are given in the top x-axis. The blue triangles represent the characteristic frequencies of the type-C QPO of high-energy data. The green squares and yellow circles mark the characteristic frequencies of the two high-frequency humps, L_l and L_h. Additionally, the gray triangles, squares, and circles denote the characteristic frequencies of the type-C QPO, L_l, and L_h in the low-energy band, respectively. The vertical dashed line represents the nodal precession frequency at the ISCO, where the Keplerian frequency equals the periastron precession frequency and the vertical red band indicates its corresponding 1σ uncertainty.