Upper panels: ⟨Γ₀⟩ as a function of Δν and T_eff. Middle panels: ratio of ⟨Γ₁⟩ and ⟨Γ₀⟩ as a function of Δν and ⟨Γ₁⟩ as a function of T_eff. For convenience, horizontal dotted black lines are plotted at specific values of 0.5, 1.0, 1.5, and 2.0. Bottom left panel: ⟨Γ₂⟩ as a function of T_eff. The colours and symbols are the same as in Fig. 4. Mean error bars on the widths have been computed both at low T_eff (T_eff ≤ 4200 K) and at high T_eff (T_eff ≥ 4200 K). These limits are equivalent to the limits in Δν chosen in Fig. 3. The fits presented in Table 3 are plotted with dashed light blue lines for RGB stars. Bottom right: ⟨Γ₁⟩ as a function of Δν with the dipole mode visibilities colour-coded. The solid and dashed lines correspond to the median values for low-visibility dipole modes () and for high-visibility dipole modes (), respectively, in blue for RGB stars and in red for He-burning stars. The turquoise, dark blue, light blue and green stars are the individual stars KIC 6847371, KIC 11032660, KIC 5461447, and KIC 6768042, respectively. They are studied in Sect. 5.3 to test the reliability of the measurements of the dipole mode width. The median values are computed in 0.2 μHz wide Δν bins and in 50 K wide T_eff bins.