Propagation diagram of the best model of KIC 007619745. The Brunt-Väisälä frequency N(r) is plotted as a solid blue curve, and the l = 1 Lamb frequency S₁(r) is plotted as a dashed green curve. p-modes with frequency ν are evanescent in the region where ν < S₁(r). Similarly, g-modes are evanescent wherever ν >N(r). The core-envelope boundary in our two-zone models is located at r_c ≈ 0.1R_∗, which usually lies in the evanescent zone common to both p- and g-modes. The peak of N(r) near r/R_∗ = 0.11 is associated with a chemically inhomogeneous layer in the radiative zone, left behind by convection as the boundary moves upward.