Inertial dips retrieved from an input parameter of α_rot = 0.98 with different values of Γ, introducing a modulation of the period-spacing pattern, and the intrinsic perturbation due to the observationnal noise (not represented here for clarity). Period-spacing patterns contain 48 modes, as in the observed case of KIC12066947. Green dots designate the modulated period-spacing pattern without this latter perturbation. The blue dip is retrieved fitting the periods as in the main text (case 1), red with an added free parameter in the likelihood (case 2) and orange fitting the period-spacings with the added free parameter (case 3).