Normalised amplitudes as a function of the inertial periods of all the ℓ₁ modes found to be unstable in the 2.9 M_⊙ (top) and 3.2 M_⊙ (bottom) models aged ~20 Myr. The details of the normalisation are given in the main text. Left (resp. right) panels correspond to an observer viewing angle of 40° (resp. 80°). Grey solid lines show the modes in a case with no rotation. Dashed and solid lines represent the PS and axisymmetric modes, respectively, while black, blue, and red colours refer to a rotation of 0.20, 0.40, and 0.60 Ω_crit, respectively.