Distribution of β Cep parameters for the modelled stars. Each panel contains the histograms for the full sample (grey) and each degree l = 0 (green), l = 1 (blue), and l = 2 (orange). From top to bottom, these panels show the initial mass distribution, the normalised core hydrogen fraction $X_c^{\prime }$, the stellar age in years, the relative convective core mass, the radius, and the K-value.