Comparison of two period spacings of mixed dipole modes within the observable region of the spectrum derived from different conditions at the core boundary. In particular, we show a model with a density jump (blue solid line), and a model with a smooth transition (orange solid line). The dashed lines denote the asymptotic period spacings for the model with a density jump (in black), and for the other model (in red). Furthermore, the grey lines correspond to the radial modes associated with both models, as they are indistinguishable in this scale. Notably, we observe clear differences in their period spacings, even in areas where dipole modes are detectable.