Notes. The three column headings below the principle headings of the “Disk” and “Halo” denote the regular, isotropic turbulent, and anisotropic turbulent magnetic fields. The rows contain a listing of all model types simulated with the following nomenclature: “D” denotes disk magnetic fields, “H” and “h” both denote halo magnetic fields, “I” and “A” are the isotropic and anisotropic turbulent magnetic fields, ■ represents the use of the λ 3.5 cm observations to gauge the wavelength-independent effects, and ★ denotes the use of the generalized opaque-layer approximation to describe the contribution of IFD (in the disk) to depolarization, as detailed in Sect. 6.1. Upper case letters “D” and “H” and the lower case “h” are used to distinguish between the presence or absence of a regular magnetic field in a given layer, respectively. The row ordering follows the model type order as in the legend of Figs. 2 and 3 for the top panel and that of Fig. 4 for the bottom panel.