Table 6: $T_{\rm b}$ gradient along the eastern jet.

$\nu$		 $\hat{T}_{\nu}$ s
[GHz] [K]  

5		 $2.1^{+2.4}_{-1.1} \times 10^{13}$ $-4.1 \pm 0.4$
8.4 $5.3^{+4.2}_{-2.3} \times 10^{12}$ $-4.1 \pm 0.3$
22 $1.9^{+1.1}_{-0.7} \times 10^{11}$ $-3.8 \pm 0.3$
43 $3.7^{+6.6}_{-2.3} \times 10^{10}$ $-4.1 \pm 0.8$
Note: We performed a power-law fit to $T_{\rm b}$ beyond a distance from the central engine r=2.5 mas as $T_{\rm b}(r) = \hat{T}_{\nu} \times r^s$, where $\hat{T}_{\nu}$ is the extrapolated brightness temperature at 1 mas and s is the power index.

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