Table 2: Parameters of the fitted model and their $2\sigma$ errors. $RM_{{\rm fg}}$ is the Faraday rotation measure arising in the Milky Way, R_m and p_m are the amplitude and pitch angle of the mode with wave number m, and $\beta _m$ is the azimuth where a mode with azimuthal wave number mis maximum. The minimum value of the residual and the value of $\chi ^2$ are shown for each fit in the bottom lines.
Units Radial range (kpc)

6-8 8-10 10-12 12-14

$RM_{{\rm fg}}$ $\rm {rad~m^{-2}}$ -93 $\pm5$ -99 $\pm5$ -93 $\pm5$ -89 $\pm4$

R₀ $\rm {rad~m^{-2}}$ +83 $\pm7$ +96 $\pm9$ +115 $\pm9$ +99 $\pm6$

p₀ deg -13 $\pm4$ -19 $\pm3$ -11 $\pm3$ -8 $\pm3$

R₂ $\rm {rad~m^{-2}}$ +45 $\pm10$

p₂ deg -2 $\pm12$

$\beta_2$ deg -43 $\pm7$

S 58 59 62 62

$\chi ^2$ 63 63 65 65

**Table 2:** Parameters of the fitted model and their $2\sigma$ errors. $RM_{{\rm fg}}$ is the Faraday rotation measure arising in the Milky Way, R_m and p_m are the amplitude and pitch angle of the mode with wave number m, and $\beta _m$ is the azimuth where a mode with azimuthal wave number mis maximum. The minimum value of the residual and the value of $\chi ^2$ are shown for each fit in the bottom lines.
	Units	Radial range (kpc)
		6-8	8-10	10-12	12-14
$RM_{{\rm fg}}$	$\rm {rad~m^{-2}}$	-93 $\pm5$	-99 $\pm5$	-93 $\pm5$	-89 $\pm4$
R₀	$\rm {rad~m^{-2}}$	+83 $\pm7$	+96 $\pm9$	+115 $\pm9$	+99 $\pm6$
p₀	deg	-13 $\pm4$	-19 $\pm3$	-11 $\pm3$	-8 $\pm3$
R₂	$\rm {rad~m^{-2}}$	+45 $\pm10$
p₂	deg	-2 $\pm12$
$\beta_2$	deg	-43 $\pm7$
S		58	59	62	62
$\chi ^2$		63	63	65	65

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