Mode linewidth as a function of the mode order for the 23 stars with their colour identified by their effective temperature, for the l = 0 mode linewidths of 4 sub-giant stars of Benomar et al. (2013) (dashed lines), and for the solar LOI data (solid black line). For the 23 stars of this study the relative 1-σ error bars range from 5% to 10%, while those of Benomar et al. (2013) range from 10% to 20%. The 10% and 20% error bars are shown as an example. The longer LOI data set has relative error bars of about 2%.