Mode widths as a function of the cyclic frequency (top) or as a function of (1 − ζ)Γ₀ (bottom), for the RGB star KIC 6144777. Radial modes are plotted with square symbols and dipole mixed modes with +; 1-σ uncertainties on Γ are indicated by vertical error bars. The value 2δ​f_res/π (Eq. (21)) plotted as a dotted line is proportional to the 4-year long frequency resolution. In the bottom plot, radial modes have been considered too, assuming they have ζ = 0 as pure pressure modes. The dashed line indicates the 1:1 relation.