Brunt–Väisälä (buoyancy) profiles, period spacings and their Fourier spectra for an M = 3.2 M_⊙ MESA stellar model. Profiles are plotted as a function of the radial coordinate x = r/R (left panels) and the buoyancy coordinate, u (middle panels), with solar metallicity and convective overshooting, f_ov = 0.015. The hydrogen mass fraction, X, is shown by dashed green lines (multiplied by 10 for clarity). The gray-shaded regions denote the receding convective core. The dipole gravity-mode period spacings, ΔP_k, are shown in the right panels, and their Fourier amplitude spectra, FT(ΔP), are overplotted in the middle panels (red lines, with super-Nyquist components in gray). The dominant Fourier-spectrum peak aligns with the sharp drop points of the Brunt profile and is labeled as u_μ in red.