Spectra for ℐ, as plotted in Fig. 1, but for the anisotropic case, with $\overline{B}=0$. The various curves refer to different values of f_an, ranging from 0.3 to 0.9 in steps of 0.2. The intensities increase with increasing f_an. The differences between different models are lower than in the cases shown in Fig. 1 for the isotropic case. Here no black dashed curve is shown because now the spectrum for a homogeneous MF cannot be a limit case. The case with f_an = 0.0 (isotropic random MF) is indistinguishable from the case f_an = 0.3.