Asymmetry profile obtained by the “numerical spectrum” model (solid red line), compared to the observed asymmetry profile (blue crosses). The data points are taken from Barban et al. (2004). For more readability, only data points corresponding to modes with angular degrees 15 ≤ l ≤ 20 have been retained. The asymmetry profile is given in terms of the parameter B (top panel), and alternatively in terms of the parameter χ (bottom panel), which is defined by Eq. (29). The error bars in the top panel correspond to the uncertainty on the observed values of the mode linewidths, which propagates to the asymmetry parameter B.