\begin{table}%t2
  \caption{Results of spectral analysis.}
  \label{ResTable}
 %\centering
\par
\begin{tabular}{l|lllll}
\hline \hline
Location &$\varphi$&$\tau_0$& $H$ & $n_0$ & $n_{{\rm col}}$\\
\hline
         &deg&   &km&$10^3~{\rm cm}^{-3}$&$10^{10}~{\rm cm}^{-2}$\\
\hline
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$\\
  \hline
 \multicolumn{6}{l}{$\varphi$: azimuth angle measured from north pole towards east.} \\
  \multicolumn{6}{l}{$\tau_0$: optical depth at line center, along
		     grazing line-of-sight ($\Delta r = 0$).}\\
  \multicolumn{6}{l}{$H$: density scale height, Eq.~(\ref{eq_n_r}); E-,W-limb: 
		     values \emph{assumed} for calculation.} \\
   \multicolumn{6}{l}{$n_0$: density at surface of neutral sodium atoms at 
		     ground level (Eq.~(\ref{eq_n_r})).}\\
   \multicolumn{6}{l}{$n_{{\rm col}}$: column density of neutral sodium atoms 
		     at ground level.}\\ 
   \hline
  \end{tabular}
\end{table}