Rotation rate Ω inferred from the asymptotic approximation of Eqs. (27) and (29) with δ_n, 1, m measurements, in the F5 case. The position of the true rotation value of the model is highlighted by the dashed grey line, with the 10% error interval in grey. Rotation rate measured only with δ_{n, 1, −1} and δ_n, 1, 1 are represented in yellow and red, respectively, while the averaged mean of the two values is shown in blue. The error bar for each Ω measurement is also represented.