Propagation path computed with ray-tracing for three IGWs: ℓ = 1, ω = 10 μHz (top), ℓ = 1, ω = 140 μHz (middle), ℓ = 2, ω = 319 μHz (bottom). The integration time, Δt, considered for each ray is specified. From the surface to the center, the black circles represent the position of the stellar surface, the bottom of the convective envelope and the edge of the convective core. The grey area corresponds to the part of the radiative zone where the wave is evanescent.