Comparison of N profiles as functions of internal mass (top panel) and period spacings of the γ-modes as functions of the eigenperiods (bottom panel). The blue line represents the fiducial model, while the red model features a bell-shaped structure in the N profile at the boundary between the convective and radiative core (see Section 4). The periodicity of the glitch corresponds to the location of the bell-shaped structure. The half width at half maximum of the bell-shaped structure presented here is 0.0012H_P.