Table 3: Parameters derived from the model of Faraday depolarization and their $2\sigma$ errors.
Ring (kpc) $q=h_{{\rm syn}}/h_{{\rm th}}$ $DP_{{\rm in}}$ $h_{{\rm th}}$ (kpc)

6-8 No statistically good fit found

8-10 $0.6\pm 0.1$ $0.1\pm 0.1$ $0.55\pm0.10$

10-12 $\rm0.4^{+0.4}_{-0.2}$ $\rm0.3^{+0.7}_{-0.1}$ $\rm0.90^{+0.90}_{-0.45}$

12-14 $\rm0.3^{+0.5}_{-0.3}$ $0.2\pm 0.2$ $\rm 1.3^{+2.6}_{-0.8}$

**Table 3:** Parameters derived from the model of Faraday depolarization and their $2\sigma$ errors.
Ring (kpc)	$q=h_{{\rm syn}}/h_{{\rm th}}$	$DP_{{\rm in}}$	$h_{{\rm th}}$ (kpc)
6-8	No statistically good fit found
8-10	$0.6\pm 0.1$	$0.1\pm 0.1$	$0.55\pm0.10$
10-12	$\rm0.4^{+0.4}_{-0.2}$	$\rm0.3^{+0.7}_{-0.1}$	$\rm0.90^{+0.90}_{-0.45}$
12-14	$\rm0.3^{+0.5}_{-0.3}$	$0.2\pm 0.2$	$\rm 1.3^{+2.6}_{-0.8}$

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