Rotational splitting δν_rot as a function of the large separation Δν, in log-log scale. The dotted line indicates the frequency resolution. The dashed and dot-dashed lines represent the confusion limit with mixed modes in RGB and clump stars, respectively, derived from Mosser et al. (2012c). Crosses correspond to RGB stars, triangles to clump stars, and squares to secondary clump stars. The color code gives the mass estimated from the asteroseismic global parameters. The vertical bars indicate the mean error bars, as a function of the rotational splitting.