Table 1: Observational features versus model constraints based on the NE2001 thermal electron model.
Observational features Model constrains
22.8 GHz free-free emission template and $\beta_{22/408~~{\rm MHz}}$ NE2001 plus filling factor for thermal electrons
EGS RM profile along the Galactic plane ASS+RING, ASS+ARM or BSS regular disk field, local field strength 2 $\mu $G
High-latitude RMs asymmetry (to the plane and center) Asymmetric toroidal halo field, field strength up to 10 $\mu $G, CRs up to 1 kpc
RM latitude profile at $100^\circ<l<120^\circ$ Favour ASS+RING or ASS+ARM model
Longitude PI asymmetry to the centre at 22.8 GHz Favour ASS+RING or ASS+ARM model
Synchrotron emission longitude profiles: 408 MHz I/22.8 GHz PI Disk CR electron component and 3 $\mu $G random field component
Isotropic high-latitude emission at 408 MHz Local excess of the synchrotron emission
Strong depolarization at 1.4 GHz Large RM fluctuations along the line of sight
  by a small $n_{\rm e}$ filling factor and a coupling of the random field with $n_{\rm e}$


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