\begin{table}%t2
 \caption{\label{machtswetten}Power-law dependence of the wavelength-integrated intensity~$I_{\rm{CO}}$ on the angular distance $\beta$ for the different
   scan directions.}
\small
%\centering
\par
%
\begin{tabular}{cccc}
\hline \hline
Slit position & ${\rm d}\!\log I_{\rm{CO}}/{\rm d}\!\log \beta$ & Slit position & ${\rm d}\!\log I_{\rm{CO}}/{\rm d}\!\log \beta$\\ 
\hline
NW  & $-1.2$ & WN  & $-1.7$\\
NE  & $-1.5$ & EN  & $-2.5$\\
SW  & $-2.3$ & WS  & $-2.9$\\
SE  & $-1.5$ & ES  & $-2.6$\\
\hline
\multicolumn{3}{l}{Overall mean} & $-1.75$ \\
\hline
\end{tabular}
\end{table}