Cutoff wavelengths (black lines) due to the in-plane component of the magnetic field as a function of height, computed from Eq. (22) for the equilibrium profile with the values of n_n00 = 10¹⁶ m⁻³ and B₀₀ = 10⁻³ T in Eqs. (5) and (7). Cutoff wavelengths for the following four shear lengths: L_s = [0, L₀/10, L₀/2, L₀] are shown with increasing width of the line for increasing L_s. The red dotted line corresponds to the density gradient scale length L_d.