Ray path for waves with angular degrees ℓ = 1 (red) and ℓ = 2 (green) for a 1.1 M_⊙ model evolution sequence. For clarity, surface reflections have been omitted. The upper part shows rays with a frequency a 10% greater than the acoustic cut-off frequency ω_a, while the bottom panels corresponds to rays with a frequency 50% greater than ω_a. The large separation indicated is the integral and can be used to identified the models in Fig. 13. The leftmost panels correspond to a model near the ZAMS, the middle panels indicate a model near the TAMS, and the rightmost panels indicate a model in the RGB. The dotted circles indicate the base of the convection zone.