ν_max versus  ⟨ Δν ⟩  for five stars observed with Kepler. For each star all results are plotted with the uncertainties derived by the different methods. The ranges in frequency over which  ⟨ Δν ⟩  values are computed are indicated with the horizontal lines above and below the results. A different colour and symbol are used for results of each star. The black solid line indicates the approximate relation between  ⟨ Δν ⟩  and ν_max.