Mode heights as a function of the cyclic frequency (top) or as a function of the radial mode height, modified when the modes are not resolved, (bottom), for the RGB star KIC 6144777. Radial modes are plotted with square symbols and dipole mixed modes with +. The Fourier spectrum is plotted in red (green) for emphasizing the radial (quadrupole) modes. The dot-dashed line provides the expected heights of dipole modes, under the assumption that the power excess mimics a Gaussian relation (dotted line). The dashed line indicates the 1:1 relation.