Estimated core and envelope rotation rates for the ensemble of reference models together with the associated correlation coefficients. Upper panels: Histogram of the estimated envelope and core rotation rates in the left and right panels, respectively. The grey line indicates the input value used to compute the synthetic rotational splittings, the black dashed line indicates the median value, and the black dotted line indicates ± one standard deviation from the median. Lower panels: Splitting correlation, ρ, as a function of the estimated envelope and core rotation rate. A threshold of ρ_thresh = 0.98 was used here. The vertical lines have the same meaning as in the upper panel. The error bar indicates the maximal random error across all rotational inversion results selected.