Comparison of the observed ellipticities of the AGB sample with calculated distribution functions. The points are the observations, and the vertical error bars denote the 1-σ uncertainties. The upper and lower gray histograms are population synthesis predictions including the measurement errors for case 1 (g(q₀) = 1) and case 2 (), respectively. The upper and lower black histograms are population synthesis predictions including a residual ellipticity for case 1 and case 2, respectively. See text for details.