Average strengths (on a linear scale) of the turbulent and ordered fields (from Fig. 12) and of the regular field (Table 1) at 3′ resolution in 1–kpc wide rings in the galaxy plane. The uncertainties in B_reg are estimated from the statistical uncertainties in RM and assuming a 5% uncertainty in ⟨n_e⟩. The systematic uncertainties in L_th and f_th of about 18% and 25%, respectively, affect all B_reg values by the same amount and are not included.