Top: Radial variation in the average spectral index, α_n, of the non-thermal intensities at $1\stackrel{\prime }{.}5$ resolution between λ3.6 cm (corrected for AME) and λ20.5 cm in 0.5–kpc wide rings in the galaxy plane. Middle: Radial variations in the average spectral index, α_n, of non-thermal intensities at 3′ resolution between λ3.6 cm (corrected for AME) and λ20.5 cm as well as between λ6.2 cm and λ20.5 cm in 1–kpc wide rings in the galaxy plane. Bottom: Radial variations in the average degrees of polarization, p_n, of the non-thermal intensities at λ3.6 cm (corrected for AME) and at λ6.2 cm, both at 3′ resolution, at λ11.3 cm at 5′ resolution, and at λ20.5 cm at 3′ resolution.