\begin{table}%t1
\caption{\label{tab_fit}Result of the fit according to Eq.~(\ref{gleichung_fit}).}
\small
 %\centering
\par
\begin{tabular}{ccc}
\hline\hline
 Fit parameter & Left beam & Right beam \\ 
\hline 
$a$ & $0.343\pm0.008$ & $1.03\pm 0.01$ \\ 
$b$ & $7.5\pm0.5$ & $5.4\pm0.1$ \\ 
$c$ & $-0.450\pm0.007$ & $0.644\pm0.004$ \\ 
\hline 
\end{tabular}
\end{table}