Comparison between a 1.05 M_⊙ BSS (M₁ = 0.61 M_⊙, M₂ = 0.51 M_⊙; orange) and its SSE counterpart (grey) for different values of X_c (0.60, 0.35, and 0.10; from top row to bottom row). Left column: Evolution of X profile in g-mode cavity as a function of normalised buoyancy radius, Π₀/Π_r. Centre column: Evolution of N as function of Π₀/Π_r (solid lines). The dotted orange line represents the FT of the BSS’s PSP, with the Nyquist limit (Π₀/Π_r = 0.5) indicated by the dashed black line. Right column: Evolution of PSPs for dipole modes (note that the scales on the period-axis are not the same for all the panels). In the left and centre panels, a light blue shaded region marks the position of the glitch, which corresponds to the steepening of the X profile and to the additional peak in the N profile.