Table 3: Frequency spectral index of the Galactic synchrotron fluctuations between 408 MHz and 1420 MHz derived from the APS.
$\beta_{(0.408-1.420)~\rm GHz}$

$\vert b_{\rm cut}\vert$ $5^{\circ}$ $10^{\circ}$ $20^{\circ}$ $30^{\circ}$ $40^{\circ}$ $50^{\circ}$ $60^{\circ}$

$b_{\rm gal} > \vert b_{\rm cut}\vert$ -2.9 -2.9 -2.9 -3.0 -3.1 -3.2 -3.2

$b_{\rm gal} < -\vert b_{\rm cut}\vert$ -2.9 -2.9 -2.9 -2.9 -3.0 -3.1 -3.1

**Table 3:** Frequency spectral index of the Galactic synchrotron fluctuations between 408 MHz and 1420 MHz derived from the APS.
$\beta_{(0.408-1.420)~\rm GHz}$
$\vert b_{\rm cut}\vert$	$5^{\circ}$	$10^{\circ}$	$20^{\circ}$	$30^{\circ}$	$40^{\circ}$	$50^{\circ}$	$60^{\circ}$
$b_{\rm gal} > \vert b_{\rm cut}\vert$	-2.9	-2.9	-2.9	-3.0	-3.1	-3.2	-3.2
$b_{\rm gal} < -\vert b_{\rm cut}\vert$	-2.9	-2.9	-2.9	-2.9	-3.0	-3.1	-3.1

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