Table 2: Results of spectral analysis.
Location $\varphi$ $\tau_0$ H n₀ $n_{{\rm col}}$

deg km $10^3~{\rm cm}^{-3}$ $10^{10}~{\rm cm}^{-2}$

Northern maximum -16. $1.7\pm {\rm dex} 0.15$ $135\pm30$ $2.6\pm{\rm dex} 0.2$ $3.4\pm{\rm dex} 0.1$

Southern maximum 193.5 $1.5\pm {\rm dex} 0.15$ $130\pm30$ $2.3\pm{\rm dex} 0.2$ $3.0\pm{\rm dex} 0.1$

Western planetary limb -91.5 $0.7\pm0.1$ (150) $1.0\pm{\rm dex} 0.2$ $1.5\pm{\rm dex} 0.1$

Eastern planetary limb 73.5 <0.1 (150) <0.14 <0.2

$\varphi$ : azimuth angle measured from north pole towards east.

$\tau_0$ : optical depth at line center, along grazing line-of-sight ( $\Delta r = 0$ ).

H: density scale height, Eq. (4); E-,W-limb: values assumed for calculation.

n₀: density at surface of neutral sodium atoms at ground level (Eq. (4)).

$n_{{\rm col}}$ : column density of neutral sodium atoms at ground level.

**Table 2:** Results of spectral analysis.
Location	$\varphi$	$\tau_0$	H	n₀	$n_{{\rm col}}$
	deg		km	$10^3~{\rm cm}^{-3}$	$10^{10}~{\rm cm}^{-2}$
Northern maximum	-16.	$1.7\pm {\rm dex} 0.15$	$135\pm30$	$2.6\pm{\rm dex} 0.2$	$3.4\pm{\rm dex} 0.1$
Southern maximum	193.5	$1.5\pm {\rm dex} 0.15$	$130\pm30$	$2.3\pm{\rm dex} 0.2$	$3.0\pm{\rm dex} 0.1$
Western planetary limb	-91.5	$0.7\pm0.1$	(150)	$1.0\pm{\rm dex} 0.2$	$1.5\pm{\rm dex} 0.1$
Eastern planetary limb	73.5	<0.1	(150)	<0.14	<0.2
$\varphi$ : azimuth angle measured from north pole towards east.
$\tau_0$ : optical depth at line center, along grazing line-of-sight ( $\Delta r = 0$ ).
H: density scale height, Eq. (4); E-,W-limb: values assumed for calculation.
n₀: density at surface of neutral sodium atoms at ground level (Eq. (4)).
$n_{{\rm col}}$ : column density of neutral sodium atoms at ground level.

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