Table 1: Properties of the synchrotron disk in M 31.
r I6 P6 $~B_{{\rm tot}}$  B  b h6 h20
(kpc) (mJy/beam) (%) ($\mu$G) ($\mu$G) ($\mu$G) (pc) (pc)
6-8 3.72 $\pm$ 0.06 30 $\pm$ 1 7.3 4.9 5.4 220 290
8-10 4.71 $\pm$ 0.05 33 $\pm$ 1 7.5 5.2 5.4 240 330
10-12 4.19 $\pm$ 0.05 31 $\pm$ 1 7.1 4.9 5.2 270 360
12-14 2.71 $\pm$ 0.05 35 $\pm$ 1 6.3 4.6 4.3 290 390
Notes: r is the radial range, I6 the average non-thermal radio intensity per beam area at $\lambda6~{\rm cm}$ (HPBW  $=3\hbox{$^\prime$ }$), P6 the non-thermal degree of polarization at $\lambda6~{\rm cm}$ obtained from the average polarized intensity per beam area divided by I6; h6and h20 the exponential scale heights of the synchrotron emission at $\lambda6~{\rm cm}$ and $\lambda20~{\rm cm}$, respectively; $~B_{{\rm tot}}$,  B and  b are the average equipartition strengths of the total, regular and turbulent fields, respectively. The uncertainty in the derived field strengths is about 20%. See Sect. 3 for further explanations.

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