heights of thermal and cosmic-ray electron densities and mean strength of coherent vertical magnetic fields were chosen based on observations of the Milky Way. In this work, we can vary the values of such global parameters because our purpose is not to reproduce observed galaxies but to demonstrate how galaxies look like in terms of FDF. The above set of parameters are curious for studying the intrinsic FDFs since they are all fundamental ones of galaxies, and major ones that mainly characterize the FDF for face-on galaxies. Even some extreme cases would be helpful to understand the nature of the FDF. We take the “ADO model” in [@arkg13] as our fiducial model and consider three variants summarized in Table \[table1\]. Considerations for some other parameters will be commented in Section \[section:4\].

[cccc]{} 1 & 0 & 1.0 & 1.0\
2 & $\sim 1.0$ & 1.0 & 1.0\
3 & 0 & 3.0 & 1.0\
4 & 0 & 1.0 & 3.0

The first parameter we vary is the mean strength of vertical magnetic field. Here, the random vertical magnetic field always exists in the model, and this component additionally incorporates the global, regular magnetic field along $z$ axis. The component 