rms (left panels) and phase-lag (right panels) spectra of the real/imaginary (blue circles), type-B (orange squares) and type-C (green triangles) QPOs in MAXI J1820+070. From top to bottom, the panels correspond to observations 1200120264_p2, 1200120265, 1200120266_p1 and 1200120266_p2 of MAXI J1820+070. The real and imaginary QPOs are from this work, while the type B and C QPOs are from observation 1200120197 analysed by Ma et al. (2023). For the comparison, we selected type-B and C QPOs with centroid frequencies most similar to those of the real/imaginary QPOs. Horizontal lines cover the range of the energy band corresponding to each marker.